Question

why light travels straight

Answer 1

Light is a stream of photons going at an incredible speed.And electrons have charges and mass as well.Lightactually doesn't always travel in a straight line.It travels in a straight linerelative to us.According to general relativity,light is seen to curve around a huge mass like the sun.
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Answer 2

Light seems to travel along straight line paths in a transparent medium. But when light enters one transparent medium to another its change direction.