Asked by  | 26th Apr, 2008, 09:26: PM

Expert Answer:

1: Arrange two pieces of cardboard, having pin holes at the centre of each, vertically, one behind the other. They
should be arranged in such a way that the two holes are exactly in the same level with each other. Now place a
candle behind and in level with the hole of the second cardboard. It will be visible when viewed through the hole
of the first cardboard. Now displace one of the cardboards slightly to its life or right candle would no longer be visible. This shows that light travels in a straight line.

2: The formation of shadows with sharp edges demonstrates the rectilinear propagation of light, i.e. the fact that light travels in straight line.


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Answered by  | 23rd May, 2008, 12:32: PM

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