How do we come to know that light travels in a straight line?
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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.
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we can take an activity in which all the holes of the comb must be closed except one. now take a torch and glow it one side it comes out as a straight line.
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