define rectilinear propagation of light?
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Do you remember being in school, and when the teacher projected something onto a screen some kids would love to make shadow animals with their hands? They would contort their hands to make a giraffe shadow or cat shadow or whatever animal they knew how to make. This experience actually tells us something: It tells us that light travels in straight lines, which is the meaning of rectilinear propagation. It's actually a unique phenomenon.
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The rectilinear propagation of light means that light travels in straight lines as a wave. ... In a pinhole camera, the light rays reflecting from the bottom of the object travel in a straight line through the pinhole to the film.
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