Question

Why does light follows a straight line path in the air

Answer 1

Answer:

ANSWER

Diffraction is the effect which causes light to change path when it meets obstacles. But as diffraction effect is very small light travels in straight line .

Explanation:

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Answer 2

Answer:

An object blocks light so that it can't reach the surface where we see the shadow. Light fills up all of the space before it hits the object but the whole region between the object and the surface is in shadow.