what is meant by ' rectilinear propagationn of light ?
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The light is visible only when all the three pinholes are aligned proving the rectilinear propagation of light. From this experiment, we can deduce that light moves from place to place through rectilinear propagation. Rectilinear is a fancy word for straight. Light travels from the source in a straight line.
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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.
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