Which of the following materials are required in the experiment to prove that light travels in a straight line?

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Wooden blocks

Stiff cardboards

Sharp pin

All of the above

answer is D.

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Detailed Solution

Wooden blocks, stiff cardboards, and sharp pins are the materials required in the experiment to prove that light travels in a straight line.
In simple words, rectilinear propagation of light can be said that the light travels in a straight line. An experiment can be conducted to prove that light travels in a straight line in which the light is passed through the small hole made in the cardboard and is then observed from the last cardboard. This experiment includes the need for three stiff pieces of cardboard, a sharp pin, a candle and three wooden blocks.

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