QIV (C) Experiment: "To prove that light travels in a straight line."
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Take a pipe and a candle. Place the candle on a table and put the pipe in front of it. Look through the pipe and you will see the candlelight, though if you bend the pipe, you will be unable to see the light anymore. This proves that light travels in a straight line.
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If two pin-holed cards align against light source light passes through it otherwise it gets obstructed by the card. This simple experiment demonstrates the straight line travel of light. This is attributed to wave and photon nature of light.
Some times light travels not in straight line, it bends around edge of an object (it is called diffraction). This is attributed to the wave nature of light.
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