describe an experiment to demonstrate the rectilinear propagation of light ?
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Take cardboards with hole in all three of them. Make whole such that all of the holes are in same line. Put the cardboard what all the cardboards and a base such that they are in same line. place a candle adjacent to the holes of the boxes you will see that we can see the candle flame only if if the cardboards are in same line this shows that light travels in a straight line thus it is a rectilinear propagation of light.
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Answer:
The pinhole camera
Explanation:
The candle looking experiment
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