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A light ray is incident on air-liquid in...

A light ray is incident on air-liquid interface at `45^@` and is refracted at `30^@`. What is the refractive index of the liquid?

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A ray of light, after passing through a medium, meets the surface separating the medium from air at an angle of 45^(@) and is just not refracted. What is the refractive index of the medium?

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