How will you show that the light travels in a sraight line
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Take a straight pipe and place a candle in front of you. Now look at the candle through the pipe. You can see the candle. Now, take a bending pipe and look at the candle through the bending pipe. You cannot see the candle because light travels in a straight line. So when you take a straight pipe, you can see light because light the pipe is straight. But when you take a bending pipe you cannot see the candle because the pipe is not straight. Light travels in straight line. Hence proved
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