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प्रश्न
State Snell'S Law.
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उत्तर
Snell's law: The ratio of sine of the angle of incidence to the sine of angle of refraction is constant for a pair of media. This constant is called the refractive index of the second medium w.r.t the first. it is generally represented by the greek letter (`mu`)
i.e `mu` = `"sin i"/"sin r"`
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