Rectilinear motion of light in a medium is caused due to:

high frequency

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short wavelength

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velocity of light

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uniform refractive index of the medium

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Solution

The correct option is D uniform refractive index of the medium
If the medium is heterogeneous having a gradient of refractive index. Then light rays will not follow a rectilinear (straight line path) motion.If the refractive index of medium is uniform then only light will show rectilinear motion through out the medium.

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