The refractive index of water with respect to air is 1.33. The refractive index of air with respect to water will be

0.25

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0.5

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0.75

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Solution

The correct option is C 0.75
Answer is D.
Refractive index is the the ratio of the velocity of light in a vacuum to its velocity in a specified medium.
The refractive index of water with respect to air is 1.33. So, the refractive index of air with respect to water will be the reciprocal.
Therefore, refractive index of air with respect to water will be 1/1.33 = 0.75.
Hence, refractive index of air with respect to water will be 0.75.

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