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Prove that light travels in a straight line with the help of an activity

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https://www.meritnation.com/ask-answer/question/how-can-you-show-that-light-travels-in-a-strait-line/light-shadows-and-reflection/3336894

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When you switch on a torch light, the light travels in a straight line as you can see that if you place a cardboard in front of the light it will not go beyond it.

There's even one more activity that :- pin up a small hole in the cardboard in a straight line and observe that it goes in a straight line.

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  • Place a lighted candle on a table. Take a short length of a hollow rubber [or plastic] tube. Look at the flame through it.
  • Bend the tube slightly now. Try to see the flame again.

You will not be able to see the flame while while th tube is bent.

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