Question

do an experiment to show that light travels in straight line​

Answer 1

Answer:

Two experiments are used to demonstrate how light travels in straight lines. In the first example, the presenter arranges three pieces of card, with holes in, in an uneven line. The light stops and cannot travel through all three cards. When she arranges the holes in a straight line, the light can travel through.

Explanation:

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Answer 2

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Aim: To show that light travels in straight line

Materials required: Three cards, lighted candle or electric torch, scissors

Method:-

• 1. Take three cards A, B, C and make a small hole in each, at the same height in the centre.
• 2. Arrange them one behind the other, so that the holes are in a straight line. This can be tested by stretching a thread through the holes.
• 3. Place the lighted candle or the electric torch behind A. Do you see light coming out from the hole on card C?
• 4. Now, shift any one of the cards such that the holes are not in a straight line. Does the light still come out? Why do you think this is so?

Observations and conclusions: When one card is shifted, the light does not come out from the hole on card C. This is because the holes are no longer in a straight line and light travels only in a straight line.