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State Snell's law of refraction of light...

State Snell's law of refraction of light?

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When refraction of light takes place, the ratio of sine of the angle of incidence to sine of the angle of refraction is a constant for a given pair of media and wavelength of light.
`""_(1)n_(2)=("sin i in medium (1)")/("sin r in medium (2)")`
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