How we can see that light travels in straight line. - Vidyadip

Question

How we can see that light travels in straight line.

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Answer

In the morning or in the afternoon, rays of light enter a slit in a door, window or a small hole in the roof.
As these rays of light from the slit or the hole move towards the floor, the dust particles in their way are clearly seen.
Due to these particles, the path of light becomes visible to us.
Thus we can see that their path is along straight lines.

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