With the help of a ray diagram,state what is mean by refraction of light.State Snell's Law for refraction of light and also express it mathematically. The refractive index of air with respect to glass is 2/3 and the refractive index of water with respect to air is 4/3.If the speed of light in glass is 2X 108 m/s,find the speed of light in (a)air, (b)water.
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