Can absolute value of refractive index be less than unity?

Yes

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Depends on situation

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Refractive index is always unity

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Solution

The correct option is D
No

Since the speed of light is maximum in vacuum, the refractive index cannot be less than unity.

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Can absolute value of refractive index be less than unity?

The correct option is D No Since the speed of light is maximum in vacuum, the refractive index cannot be less than unity.

The correct option is D
No

Since the speed of light is maximum in vacuum, the refractive index cannot be less than unity.