Define rectilinear propagation of light. Also its use.
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The Rectilinear Propagation of Light describes that Light travels in a Straight Line. A mirror changes the direction of Light that falls on it and it travels in a Straight line Path. Reflection of Light occurs when light bounces off a polished surface.
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Rectilinear propagation of light is the property of light by which light travels in a straight line. But the light changes its direction if it is reflected by a mirror or refracted by a lens.
It is used in laser lights, pinhole cameras etc.
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