Question

Discuss one activity to demonstrate the rectilinear propagation of light.​

Answer 1

Answer:

Light travels in a straight line. This is called rectilinear propagation of light.

Activity:

Take a straight straw and look at the light rays through it.

Take another straw which is bent and try to look at the light rays through it. You will observe that when the straw was straight you could see the light and when the straw was bent you could not see the light.

This means that we cannot bend the ray of light to travel through the bent straw.

Thus, this activity proves that light travels in a straight line.

Explanation:

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Answer 2

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1)-We take three pieces of cardboard. Place them one on the top of one another and make a hole in the middle of each cardboard by using a thick nail. Erect these cards up on the table at a short distance away from each other.

2)-Take a candle which is of the same height as the holes in the cards. Light the candle and place it in front of the cards. We see that the light of the candle is visible only when the holes on cards lie in a straight line.

3)-If we disturb them the light of the candle disappears. This experiment shows that light propagates in a straight line.

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