Class 6 Science Chapter 8 Light, Shadows & Reflections.

THIS PAGE INCLUDES :

- CHAPTER OVERVIEW -
These Topics are covered in NCERT Class 6 Science Chapter 8 Light, Shadows & Reflections.
# Light & Its Sources.
# Objects & Its Types.
# Shadow, Its Characteristics & Formation.
# Solar & Lunar Eclipse.
# Pin-Hole Camera.
# Reflection & its Types.
# Mirror & Its Types.
# Image formed by Plane Mirror.

Here at MSEducator.in you get Complete FREE Study Material for Class 6 Science Chapter 8 - Light, Shadows & Reflections.
Which includes :-
# Class 6 Science Chapter 8 Explanation.
# Class 6 Science Chapter 8 Important Questions.


# NCERT Solutions :
Class 6 Science Chapter 8 NCERT Solutions are completely based on NCERT Book for Class 6 Science Chapter 8 Light, Shadows & Reflections. These NCERT Solutions for Class 6 Science Chapter 8 Light, Shadows & Reflections contains Answers and detailed explanation of Questions talked about in NCERT Class 6 Science Chapter 8 Light, Shadows & Reflections. Here we suggest you to go through these Class 6th Science Chapter 8 NCERT Solutions thoroughly to strengthen you understanding about this Chapter of Class 6 Science.NCERT Solutions for Class 6 Science Chapter 8 - Q1.
Q1. Rearrange the boxes given below to make a sentence that helps us understand opaque objects.

Ans. OPAQUE OBJECTS MAKE SHADOWS
NCERT Solutions for Class 6 Science Chapter 8 - Q2.
Q2. Classify the objects or materials given below as opaque, transparent or translucent and luminous or non-luminous :
Air, water, a piece of rock, a sheet of aluminium, a mirror, a wooden board, a sheet of polythene, a CD, smoke, a sheet of plane glass, fog, a piece of red hot iron, an umbrella, a lighted fluorescent tube, a wall, a sheet of carbon paper, the flame of a gas burner, a sheet of cardboard, a lighted torch, a sheet of cellophane, a wire mesh, kerosene stove, sun, firefly, moon.
Ans.
# Opaque Objects : A piece of rock, a sheet of aluminium, a mirror, a wooden board, a CD, a piece of red hot iron, an umbrella, a lighted fluorescent tube, a wall, a sheet of carbon paper, the flame of a gas burner, a sheet of cardboard, a lighted torch, kerosene stove, sun, firefly, moon.
# Translucent Objects : A sheet of polythene, smoke, fog.
# Transparent Objects : Air, water, a sheet of plane glass, a sheet of cellophane.
# Luminous Objects : A piece of red hot iron, a lighted fluorescent tube, the flame of a gas burner, a lighted torch, sun, firefly.
# Non-luminous Objects : Air, water, a piece of rock, a sheet of aluminium, a mirror, a wooden board, a sheet of polythene, a CD, smoke, a sheet of plane glass, fog, an umbrella, a wall, a sheet of carbon paper, a sheet of cardboard, a sheet of cellophane, a wire mesh, kerosene stove, moon.
NCERT Solutions for Class 6 Science Chapter 8 - Q3.
Q3. Can you think of creating a shape that would give a circular shadow if held in one way and a rectangular shadow if held in another way?
Ans. Yes, there are many things which give a circular shadow if held in one way and a rectangular shadow if held in another way.
E.g. A cylinder, a circular disc etc.


NCERT Solutions for Class 6 Science Chapter 8 - Q4.
Q4. In a completely dark room, if you hold up a mirror in front of you, will you see a reflection of yourself in the mirror?
Ans. No, in a completely dark room no image will be formed because there is no light in the room so no reflection of light takes place and no image will be formed.

Here at MSEducator.in you get Complete FREE Study Material for Class 6 Science Chapter 8 - Light, Shadows & Reflections.
Which includes :-
# Class 6 Science Chapter 8 Explanation.
# Class 6 Science Chapter 8 Important Questions.


# Chapter Notes :
Class 6 Science Chapter 8 Light, Shadows & Reflections Notes pdf which includes Class 6 Science Chapter 8 Light, Shadows & Reflections Notes. These Class 6 Science Chapter 8 Notes pdf are completely based on NCERT Book for Class 6 Science Chapter 8 Light, Shadows & Reflections. These notes contains detailed explanation of 6th class science Chapter 8 Light, Shadows & Reflections. I suggest you to go through these Notes to strengthen you understanding about this Chapter of Class 6 Light, Shadows & Reflections.Class 6 Science Chapter 8 notes.

Here at MSEducator.in you get Complete FREE Study Material for Class 6 Science Chapter 8 - Light, Shadows & Reflections.
Which includes :-
# Class 6 Science Chapter 8 Explanation.
# Class 6 Science Chapter 8 Important Questions.


# Extra Questions :
Class 6 Science Chapter 8 Extra Questions are completely based on NCERT Book for Class 6 Science Chapter 8 Light, Shadows & Reflections. These Extra Questions contains detailed explanation or Definition of some Terms talked about in NCERT Class 6 Science Chapter 8 Light, Shadows & Reflections. You also get some short questions and long questions regarding Chapter 8 Light, Shadows & Reflections of class 6 Science and Some Value Based Questions regarding NCERT Class 6 Science Chapter 8 Light, Shadows & Reflections. Here we suggest you to go through these Class 6th Science Chapter 8 Extra Questions to strengthen you understanding about this Chapter of Class 6 Science.
# Class 6 Science Chapter 8 - Definition :
Q. Define light.
Ans. Light is a form of energy which when falls on the object enables us to see them.
Q. Define luminous object.
Ans. An object having its own light is called a luminous object.
E.g. Sun, Torch, etc.
Q. Define non-luminous object.
Ans. An object which does not have its own light is called a non-luminous object.
E.g. Moon, Chair, etc.
Q. Define Incandescent Objects.
Ans. The bodies which emit light when heated to a very high temperature are called incandescent Objects.
E.g. Electric bulb, Red Hot Iron Rod, etc.
Q. Define transparent object.
Ans. An object which allow light to pass through it, is called transparent object.
E.g. Clear glass, Water, etc.
Q. Define translucent object.
Ans. An object which allows only a small part of light through it, is called translucent object.
E.g. Wax paper, Fog, etc.
Q. Define opaque object.
Ans. An object which does not allow light at all to pass through it, is called opaque object.
E.g. Wooden Sheet, Wall, etc.
Q. Define Shadow.
Ans. The Dark patch formed behind an Obstacle (opaque object) is called Shadow.
Q. Define obstacle.
Ans. An object which comes to the path of light is called an obstacle.
Q. Define screen.
Ans. Screen is a surface on which images are formed.
Q. Define Umbra.
Ans. The inner region of a shadow which is completely dark is called umbra.
Q. Define Penumbra.
Ans. The outer region surrounding the umbra which is a partially dark region is called penumbra.
Q. Define Eclipse.
Ans. The phenomenon of formation of shadows of celestial bodies on one another is called an eclipse.
Q. Define Solar Eclipse.
Ans. When Shadow of moon falls on Earth it causes Solar Eclipse.
Q. Define Lunar Eclipse.
Ans. When Shadow of earth falls on the moon it cause Lunar Eclipse.
Q. Define Pinhole Camera.
Ans. A pinhole camera is a device which forms a photograph like image of a bright object on a screen.
Q. Define Reflection.
Ans. The phenomenon of bouncing back of light by a highly polished surface is called reflection.
Q. Define Incident ray.
Ans. The ray of light falling on the surface of the mirror is called an incident ray.
Q. Define Reflected ray.
Ans. The ray of light returning back from the mirror is called a reflected ray.
Q. Define Mirror.
Ans. A smooth, polished reflecting surface is called a mirror.
Q. Define lateral inversion.
Ans. Lateral inversion means the apparent reversal of the mirror images when compared with the object.
E.g. Right side of the Object appear as Left side in the Image.
Q. Define Periscope.
Ans. Periscope is an optical object by which we can see objects located above our line of sight.
E.g. Periscope present in Submarine to see the objects above the sea level from inside of water.
Class 6 Science Chapter 8 Extra Questions.

Here at MSEducator.in you get Complete FREE Study Material for Class 6 Science Chapter 8 - Light, Shadows & Reflections.
Which includes :-
# Class 6 Science Chapter 8 Explanation.
# Class 6 Science Chapter 8 Important Questions.


# Class 6 Science Chapter 8 - Very Short Answer Questions :
Q. Name the most important Natural Source of light on Earth.
Ans. Sun
Q. How does a light ray travel?
Ans. Light ray travels in a straight line.
Q. Name the materials that allow only some amount of light to pass through them.
Ans. Translucent
Q. How can you convert a transparent glass sheet into a translucent sheet?
Ans. By applying oil ,grease, etc. OR by frosting it with the exhaled air.
Q. You have 3 opaque strips with very small holes of different shapes as shown in Figure. If you obtain an image of the sun on a wall through these holes, will the image formed by these holes be the same or different?

Ans. The image formed by these holes will be the same in all the three cases.
Q. Dark patch behind an opaque object is called?
Ans. Shadow
Q. When does a shadow formed?
Ans. A shadow is formed when an opaque object is placed in the path of light.
Q. Name the parts that a shadow of an object has?
Ans. A Shadow has two parts Umbra and Penumbra.
Q. What are the three things that are required for the formation of shadows?
Ans. To form a shadow we require an opaque object, a source of light and a screen.
Q. Look at the given figure. Will there be any difference in the shadow formed on the screen in A and B.

Ans. No, there will not any difference in the shadow formed on the screen in A and B.
Q. What information does a shadow give about an object?
Ans. A shadow gives information about the shape of the object.
Q. Does the colour of the object affect the colour of the shadow?
Ans. No, the colour of the object does not affect the colour of the shadow.
Q. Why we can not form shadow with the help of light and an opaque object.
Ans. To form a shadow we require an opaque object, a source of light and a screen.
Q. What type of objects does not cast shadow. Why?
Ans. Transparent and some translucent objects do not cast shadow because light passes through them.
Q. Three identical towels of red, blue and green colour are hanging on a clothes line in the sun. What would be the colour of shadows of these towels?
Ans. The colour of shadows of all three towels will be the same.
Q. What is a pinhole camera?
Ans. A pinhole camera is a device which forms a photograph like image of a bright object on a screen.
Q. What type of images are formed by a pinhole camera?
Ans. The images formed by a pinhole camera are upside down, i.e., inverted image.
Q. Whether the moon is luminous or non-luminous body?
Ans. Moon is non-luminous body.
Q. Why the moon is not considered as a luminous body?
Ans. Moon is non-luminous body because it does not emits its own light.
Q. If Moon is a non-luminous object then, How does it shine at night?
Ans. Moon shine at night because it reflects the light of the sun at night.
Q. The Shadow of moon on Earth is called?
Ans. Solar Eclipse
Q. The Shadow casted by earth on the moon is called?
Ans. Lunar Eclipse
Q. The eclipse that takes place when moon comes between Sun and earth.
Ans. Solar Eclipse
Q. The eclipse that takes place when earth comes between Sun and moon.
Ans. Lunar eclipse
Q. Why lunar eclipse not occur every month?
Ans. Lunar eclipse do not occur every month because the Earth’s orbit around the sun is not in the same plane as the moon’s orbit around the earth.
Q. How do we see the objects?
Ans. We see the objects due to the reflection of light, when the rays of light from source fall on an object they bounce back and reach our eyes this is how we are able to see an object.
Q. Bouncing back of light from a surface is called?
Ans. Reflection
Q. What is mirror?
Ans. A smooth, polished reflecting surface is called a mirror.
Q. What type of image is formed by a plane mirror?
Ans. Erect and laterally inverted image is formed by a plane mirror.
Q. What is the size of the image formed by a plane mirror?
Ans. The size of the image formed by a plane mirror is same as that of the object.
Q. Observe the given picture a sheet of some material is placed at position ‘P’, still the patch of light is obtained on the screen. What is the type of material of this sheet?

Ans. A sheet of transparent material is placed at ‘P’.
Q. Why we are able to see our face in the mirror?
Ans. Due to reflection of light.
Q. Why we cannot see our image in the mirror in complete dark room?
Ans. We cannot see our image in the mirror in complete dark room because there is no light to reflect.
Q. Name the kind inversion that shows your right arm left and left arm right.
Ans. Lateral Inversion
Q. How can sailors in a submarine completely submersed in water see ships that are moving on the surface of water?
Ans. Submarines have a special device called a periscope. It allows people inside the submarine to see what's going on above water.
Q. Why polished surface cause glares in our eyes?
Ans. Polished surface cause glares in our eyes because they produce regular reflection of light.
Q. What do you mean by scattering of light?
Ans. When a beam of light falls on a rough surface, it turned back in different directions this phenomenon is called scattering of light.
Class 6 Science Chapter 8 Extra Questions.

Here at MSEducator.in you get Complete FREE Study Material for Class 6 Science Chapter 8 - Light, Shadows & Reflections.
Which includes :-
# Class 6 Science Chapter 8 Explanation.
# Class 6 Science Chapter 8 Important Questions.


# Class 6 Science Chapter 8 - Short Answer Questions :
Q. What is the difference between transparent and translucent object?
Ans. If we are able to see clearly through an object, it is said to be transparent. Whereas there are some objects through which we can see but not clearly such objects are known as translucent objects. Transparent objects allow light to pass through them completely whereas translucent objects doesn’t allow light to pass through them completely.
Q. State difference between a luminous and a non-luminous Objects.
Ans. The objects which emit light of their own are called luminous objects like sun, stars, burning candle, etc. On the other hand the objects which does not emit light of their own are called non-luminous objects like moon, earth, book, blackboard, etc.
Q. Why moon is not a luminous body? How it Glows at night?
Ans. Moon is not a luminous body because it does not emit light of its own. Moon Glows at night because it reflects the light of the Sun.
Q. Why we should not look at the sun directly?
Ans. The sun radiates ultraviolet radiations that could be extremely harmful for our eyes. This is why we should never see the sun with naked eyes.
Q. What is a shadow? How is it formed? What are the essential conditions for formation of shadows?
Ans. The dark patch formed behind an opaque object is called a shadow. It is formed when light ray falling on the surface is blocked by an opaque object.
# Conditions for formation of shadow are :
1. there is a source of light.
2. there is an opaque object in the way of light.
3. the light ray falling on the opaque object is blocked by it.
Q. A sheet of plywood, a piece of muslin cloth and that of a transparent glass, all of the same size and shape were placed at A one by one in the arrangement shown in Figure. Will the shadow be formed in each case. If yes, how will the shadow on the screen be different in each case? Give reasons for your answer.

Ans. Shadow will not be formed in each case. Shadow will be formed by the sheet of plywood and the piece of muslin cloth. The sheet of plywood will form a dark shadow as it blocks the path of light completely. The piece of muslin cloth will form a lighter shadow as it allow light to pass through it partially.
Q. Suggest a situation where we obtain more than one shadow of an object at a time.
Ans. We can obtain more than one shadow of an object if light from more than one source falls on it. For example, during a match played in a stadium, multiple shadows of players can be seen.
Q. Three torches A, B and C shown in Figure are switched on one by one. The light from which of the torches will not form a shadow of the ball on the screen.

Ans. The light of torch at position C will not form a shadow of the ball on the screen.
Q. In what manner does size of our shadow change when we walk in sunlight?
Ans. The size of our shadow changes with the time of the day. As we walk in the noon, shadow will be smallest as the Sun is exactly over the head and a little light is blocked by our body to form shadow. During sunrise (sunset), the shadow formed is larger in size, as the Sun rises from the horizon (sets in the horizon) and more sunlight is blocked by our body to form longer shadow.
Q. A football match is being played at night in a stadium with flood lights ON. You can see the shadow of a football kept at the ground but cannot see its shadow when it is kicked high in the air. Explain.
Ans. We can see the shadow of football lying on the ground because the ground acts as a screen for it. However, when the football is kicked high, the ground, which is acting as a screen is away from the football, hence no shadow of the football will be formed on the ground.
Q. What is umbra and penumbra? Explain with the help of Diagram.
Ans. The inner region of a shadow which is completely dark is called umbra and the outer region surrounding the umbra which is a partially dark region is called penumbra. These two regions in shadows are formed when an opaque body is placed in front of an extended or slit source.

Q. A student covered a torch with red cellophane sheet to obtain red light. Using the red light she obtains a shadow of an opaque object. She repeats this activity with green and blue light. Will the colour of the light affect the shadow ? Explain.
Ans. The colour of light will not affect the shadow, because shadow is the dark patch formed when an object obstructs the path of light and hence no light reaches in the shadow region.
Q. What is an eclipse? What are the two types of eclipse?
Ans. The formation of shadows by celestial bodies on one another is called an eclipse.
# There are two types of eclipse.
1. Solar Eclipse : When the moon comes in between the sun and the earth, the shadow of the moon falls on the earth, this is called solar eclipse.
2. Lunar Eclipse : When the earth comes in between the sun and the moon, the shadow of the earth falls on the moon, this is called lunar eclipse.
Q. What is a pinhole camera? What type of images is formed by it?
Ans. A pinhole camera is a device which forms a photographic image of a bright object on a screen. The images formed by a pinhole camera are upside down (inverted images).
Q. What materials can be used to make a pinhole camera? How can it be used?
Ans. Pinhole camera can be made with simple material like cardboard, tracing paper, etc. It can be used to form an image of the sun and brightly lit objects.
Q. What is natural pinhole camera? What type of images is formed by it?
Ans. When sunlight falls on the leaves of a tree, the gaps between the leaves act as a natural pinhole camera. Afterwards round shaped images are formed on the ground. These are pinhole images of the sun.
Q. Using a pinhole camera a student observes the image of two of his friends, standing in sunlight, wearing yellow and red shirt respectively. What will be the colours of the shirts in the image?
Ans. The colours of the image of the shirts will be the same as the colour of the shirt.
Q. What is a mirror? What type of images is formed by it?
Ans. The glass sheet having a polished, shiny, smooth and reflective surface on the front side is called a mirror. The images formed by a mirror are erect and laterally inverted.
Q. Why we are able to see our image in the mirror?
Ans. Light rays reflected from parts of our body fall on mirror and are reflected back. When these reflected rays reach our eyes (reflected on our retina), we can see our image in the mirror.
Q. What is lateral inversion?
Ans. Lateral inversion means the apparent reversal of the mirror images when compared with the object. For example, right side of the object appear as left side in the image.
Class 6 Science Chapter 8 Extra Questions.

Here at MSEducator.in you get Complete FREE Study Material for Class 6 Science Chapter 8 - Light, Shadows & Reflections.
Which includes :-
# Class 6 Science Chapter 8 Explanation.
# Class 6 Science Chapter 8 Important Questions.


# Class 6 Science Chapter 8 - Long Answer Questions :
Q. What are the different types of object based on their ability to pass the light? Give suitable examples of each objects.
Ans. On the basis of ability to pass light through an object, objects are classified into three main groups :
(a) Transparent objects.
(b) Translucent objects.
(c) Opaque objects.
(a) Transparent Objects : Objects through which light can pass easily are called transparent objects.
E.g. Glass, water, air, etc.
(b) Translucent Object : Objects through which light can pass partially and through which we cannot see clearly are called translucent objects.
E.g. Tracing paper, Butter paper, smoke, fog, etc.
(c) Opaque Objects : Objects through which light cannot pass at all and through which we cannot see are called opaque objects.
E.g. Wood, plastic box, etc.
Q. What can you say about the path of light? Describe an experiment to support your answer.
Ans. Light travels in a straight line. It is also called rectilinear propagation of light.

Experiment :
- Take three cardboard squares of equal size. Locate the centre of each pieces of cardboard by drawing the diagonals.
- With the help of a nail, make a hole at the centre of each cardboard. Now fix the three card boards on plasticine or on stands so that they remain upright.
- Arrange the three card boards A, B and C, one behind the other such that their centres are in the same horizontal line. You can pass a knitting needle through the holes to confirm if they are in a straight line.
- Now place a burning candle in front of the board C and look through the pinhole in board A. The flame will be clearly visible. This shows that light travels in a straight line. Now, move board B slightly and again look through the pinhole in board A as shown in the figure.
- You will not be able to see the flame. This shows that light does not travel in a zig-zag way.
Q. What is a shadow? How does it formed? How does the colour of an opaque object affect the colour of the shadow?
Ans. A shadow is a dark outline cast by an opaque object that blocks light coming from a source of light. It is formed when light hits the opaque object which does not let the light pass through. Everywhere else around the opaque object, the light continues in a straight path until it bounces off the ground or wall behind the object. The wall or ground behind the opaque object is the screen. On this screen there is a dark patch, or shadow, with the same outline as the object surrounded by light. The colour of the opaque object does not affect the colour of the shadow that is formed.
Q. You want to cast the shadow of your pencil on the wall with the help of candle in a dark room. How can you obtain the shadow of same size, small size and big size of the same pencil?
Ans.
(a) The shadow of the pencil will be small when the pencil is taken close to the wall and away from the candle.
(b) The shadow will be big in size when the pencil is taken closer to the candle.
(c) To get the same sized shadow as the pencil is, adjust the distance between the wall, pencil and candle at equal distances.
Q. A student had a ball, a screen and a torch in working condition. He tried to form a shadow of the ball on the screen by placing them at different positions. Sometimes the shadow was not obtained. Explain.
Ans. Some of the reason can be
(a) The screen is away from the ball.
(b) The beam of light from the torch is falling parallel to the screen on the ball.
(c) The torch is kept away from the ball.
Q. What is a pinhole camera? How does it works? Explain its construction and image formation.
Ans. A pinhole camera is a device which casts a photographic image of a bright object on a screen. It works on the principle that light travels in a straight line. A pinhole camera can be made with simple materials and can be used to obtain the image of sun and brightly lit objects. It consists of a box made of metal or a cardboard that has a fine hole in one face. A plate or any translucent sheet on the side opposite to the face containing the pinhole serves as a screen. Images formed by a pinhole camera are upside down, i.e., inverted images.
Q. What is the difference between a shadow and an image?
Ans.

Class 6 Science Chapter 8 Extra Questions.

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Which includes :-
# Class 6 Science Chapter 8 Explanation.
# Class 6 Science Chapter 8 Important Questions.


# Class 6 Science Chapter 8 - Value Based Questions :
Q. Parthiv’s grandmother looked a little worried today. She asked everybody to have their lunch after 3 p.m. When Parthiv asked the reason she said, “today is solar eclipse at 2:15 p.m.” Parthiv made her relaxed and said this is a natural phenomenon and nothing bad or unpleasant things are related to this. His grandmother listen him carefully.
(a) What is solar eclipse?
Ans. When the earth, moon and sun are in a straight line, with moon in between, the shadow of moon falls on the earth and this is known as solar eclipse.
(b) Why do you think that some people believe that these eclipses will have some bad effect on them?
Ans. Because these type of people are superstitious and doesn’t know the scientific reason behind this.
(c) Do you experienced such superstition in your life?
Ans. Yes, many a times by my parents and grandparents.
(d) What value of Parthiv is shown here?
Ans. Parthiv is an intelligent and mature boy with scientific aptitude.
Q. Suman’s teacher asked their class to make a pinhole camera by themselves. Suman read the activity 5 given in his textbook on how to make a pinhole camera. But she was unable to get the image of a well lit object. She was very upset. Her elder brother on observing her pinhole camera found that the hole made by her was quite large. He rectified Suman’s mistake and helped her making another pinhole camera. Now, Suman can see the image of the object.
(a) On which principle of light does a pinhole camera works?
Ans. Rectilinear propagation of light
(b) Why was Suman unable to get the image of a well lit object?
Ans. She made a larger hole instead of a fine hole.
(c) How does the formation of the image by a pinhole camera is affected by size of the hole?
Ans. The finer will be the hole the sharper will be the image formation and vice versa.
(d) What values of Suman is shown here?
Ans. Suman got upset easily without looking and inspecting the actual cause, She is bit careless in doing his activity.
Class 6 Science Chapter 8 Extra Questions.

Here at MSEducator.in you get Complete FREE Study Material for Class 6 Science Chapter 8 - Light, Shadows & Reflections.
Which includes :-
# Class 6 Science Chapter 8 Explanation.
# Class 6 Science Chapter 8 Important Questions.


Light, Shadows & Reflections class 6 mcq
# MCQ Test :
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