Question

what is rectilinear propagation of light

Answer 1

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Rectilinear Propagation of Light is the tendency of light to travel in straight Lines. In a homogenous transparent medium light travels in a straight line and this is known as rectilinear propagation of light. 

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Answer 2

Means the light travels on straight lines as a wave the same rectilinear propagation occurs from the top of the object to the film at the back of pinhole camera

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