d. The rectilinear propagation of light means:
i light travels in a rectangular path
iii. light does not move
ii. light travels in a straight path
iv. light changes its direction
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Rectilinear propagation of light refers to the propensity of light to travel along a straight line without any interference in its trajectory. When light travels through a medium, say air or water, it follows a straight line. However, the path only changes in case there is a shift in the medium.
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option 3 thank you .i hope it was help you.
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