Chapter 11

Light, Shadows And Reflections

 

Introduction

We see so many colourful and unique objects all around us. On our way to school, we pass by buses, automobiles, bicycles, trees, animals, and occasionally, flowers. How do we see all of these objects? Consider the same locations at night if it were dark. What are you going to see? Assume you enter a fully dark room. Is it possible for you to see anything in the room? But, isn't it true that when you light a candle or a torch, you can see the objects in the room? Things cannot be seen in the absence of light – light allows us to see them.

A torch bulb is an object that emits its own light. Another well-known entity that emits its own light is the sun. Its light lets us view the world during the day. Luminous objects, such as the sun, give off or emit light of their own.

Light, Shadows, and Reflections is an NCERT Science chapter for class 6 that exposes you to the world of light and its qualities. Surprisingly, both mirrors and reflections make use of light, but this is owing to the differences in their properties. You've probably seen rainbows form after a rainstorm—this is due to reflection.

 

Remember how in Chapter 4 we classified objects as opaque, transparent, or translucent? An opaque item is one that we can't see through at all. While, if you can see clearly through an object, it is transparent and allows light to travel through it.
Last of all, translucent objects are those through which we can see certain items, but they aren't particularly clear. Translucent objects are those that are transparent to the naked eye.

At home, we all use mirrors. When you look in the mirror, you see your own reflection. The image you see in the mirror is a reflection of your own face. Other things in front of the mirror are also reflected. In the water of a pond or a lake, we occasionally see reflections of trees, buildings, and other objects.

Exercises and Solutions 

Rearrange the boxes given below to make a sentence that helps us understand opaque objects.

Opaque objects puzzle

Solution : The given boxes can be rearranged to form ‘Opaque Objects Make Shadows’ as shown below

2. Determine whether the following objects or materials are opaque, transparent, or translucent, and whether they are luminous or non-luminous:

Air, water, a 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, a lighted torch, a sheet of cellophane, a wire mesh, a kerosene stove, sun, firefly, the moon

Solution: A rock, a sheet of aluminium, a mirror, a wooden board, a CD, an umbrella, a wall, a sheet of carbon paper, and a sheet of cardboard are examples of opaque materials.

Air, water, and a sheet of plane glass are all transparent.

A sheet of polythene, smoke, fog, a sheet of cellophane, and a wire mesh are all translucent.

A lighted fluorescent tube, the flame of a gas burner, a lighted torch, the sun, a firefly, and a kerosene stove are all examples of 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, the moon

3. Can you imagine a shape that casts a circular shadow when held one way and a rectangular shadow when held the other?

Solution: Yes.

4. If you hold up a mirror in front of you in a completely dark room, will you see a reflection of yourself in the mirror?

Solution:  No, because the light will not fall on the mirror to reflect the image in a dark room, a mirror reflection of the image will not be visible.

  1. Make a line of your buddies with the letters A, B, C, and D. Allow one of your friends to participate. Stand in front of them, facing them, with a mirror held out to them Each person can now determine who they can see in the Mirror. A, B, C, or D are the options.

Is it possible for B to see A in the mirror if A can see B in the mirror? Likewise, for any two pairs from A, B, C, or D? Is B able to see A in the mirror if A is unable to see him in the mirror? Likewise, for any two pairs from A, B, C, or D?

Ans : This activity teaches us about how light travels through mirrors and is reflected.

  1. Daayan-Baayan— In your right hand, take a comb and bring it up to your hair, then gaze in the mirror. There's your old friend, grinning at you.

Wait, in your mirror reflection, attempt to figure out which hand is holding the comb. Is it the right or left hand? Is it true that you were holding it in your right hand?

Ans: A mirror appears to change the right hand into the left hand and the left into the right hand,while a pinhole camera appears to give us upside down images.

The notion of opacity, transparency, and translucency, the production of shadows, concepts of reflection, creating pinhole camera, a mirror and its functions are all covered in Chapter 11 of NCERT Solutions for Class 6 Science. One of the most effective strategies to improve one's abilities and knowledge is to use NCERT Solutions. It contains all of the necessary study materials to assist pupils succeed in their exams. From the standpoint of the test, this is a crucial chapter.  You can also get Light Shadows and Reflections Class 6 NCERT Solutions from MSVgo’s website to help you go through the entire curriculum and get the best grades possible in your exams. So download the app now.

 

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