State Snell's law of refraction, express refractive index of a medium as mathematical formula and state the condition for Snell's law to be valid.
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Snells law of refraction states that it is a formula used to describe the relationship between angles of incidence and refraction, when referring to light or other waves passing through a boundary between two different isotropic medium, such as water, glass, or air.
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the ratio of sine of angle of incidence is equal to the ratio of sine of angle of refraction;sinei/siner=constant. it is different for different media
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