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Define Snell's law of refraction. A ray ...

Define Snell's law of refraction. A ray of light is incident on a glass slab at angle of incidence of `60^(@)`. If the angle of refraction be `32.7^(@)`, calculate the refractive index of glass. (Given: sin`60^(@)=0.866` and `sin32.7^(@)=0.540)`.

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