Question

why light goes in straight line
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Answer 1

Explanation:

Light travels in a straight line because the diffraction effect is least due to the small wavelength of light. So the small wavelength of light produces negligible diffraction and therefore light travels along a straight line.

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Answer 2

Light travels in straight lines primarily due to the fact that light is a wave. However, light can change its path (away from a straight line) when it is incident on certain obstacles. This effect is commonly reffered to as diffraction. Since diffraction is very small effect, light is generally assumed to travel in straight line.

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