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Absolute and Relative Refractive Index

the refractiv...

Question

the refractive index of water for light going from air to water is 1.33. find the refractive index of air for a beam of light going from water to air.

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Solution

refractive index of water for light going from air to water(1.33)
= 1/(refractive index of air for light going from water to air)
So,refractive index of air for light going from water to air = 1/(1.33) = 0.75

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