NCERT Class VI Science Solutions: Chapter 11 – Light Shadows and Reflections Part 4

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Question 13:

Suggest a situation where we obtain more than one shadow of an object at a time.

Answer:

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 being played in a stadium, multiple shadows of players are seen].

Image of show multiple shadow of players

Image of Show Multiple Shadow of Players

Image of show multiple shadow of players

Question 14:

On a sunny day, does a bird or an aero plane flying high in the sky cast its shadow on the ground? Under what circumstances can we see their shadow on the ground?

Answer:

No. Shadow of the bird can only be seen when the bird is flying very low close to the ground.

Question 15:

You are given a transparent glass sheet. Suggest any two ways to make it translucent without breaking it.

Answer:

  1. By applying oil, grease and butter on it or pasting a butter paper on it.

  2. Grinding (rubbing) the surface of the glass by any abrasive material.

Question 16:

A torch is placed at two different positions A and B, one by one, as shown in Fig.

Result for two different positions A and B

Two Different Positions a and B

Result for two different positions A and B

The shape of the shadow obtained in two positions is shown in Fig.

Result for two positions

Two Positions

Result for two positions

Match the position of the torch and shape of the shadow of the ball.

Answer:

A -> a

B -> b

Question 17:

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.

Answer:

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.