Question

why the light travel in straight light only​

Answer 1

In a dusty atmosphere it is sometimes possible to see light travelling and it does appear to be moving in a straight line. The fact that light travels can be demonstrated by putting an object in its path. ... As light does appear to travel in straight lines then light is usually modelled as straight lines in drawings.

Answer 2

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Light travel in straight path only because it contains no mass and is only composed of particles which are not affected by any factor so it moves in straight path.
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