general formula of doppler effect in light waves

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For sound waves, the Doppler formula for frequency shift differs slightly between the two situations: (i) source at rest; observer moving, and (ii) source moving; observer at rest. The exact Doppler formulas for the case of light waves in vacuum are, however, strictly identical for these situations. Explain why this should be so. Would you expect the formulas to be strictly identical for the two situations in case of light travelling in a medium?

Q. In Doppler effect of light, the term "red shift" is used for _________.

Q. Explain Doppler effect in light. Distinguish between Red shift and Blue shift.

Q. When the light source is approaching, the Doppler effect for light is known as:

Q. When the light source is moving away, the Doppler effect for light is known as:

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