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Light enters from air to glass having refractive index 1.50. What is the speed of light in the glass ? The speed of light in vacuum is 3 xx 10^(8) m s^(-1).

Answer»

Solution :Given that speed of light in vacuum `c = 3 XX 10^(8) ms^(-1)`, and REFRACTIVE index of glass `n_(8) = 1.50`
From the relation `n = (c)/(upsilon)`, we have
Speed of light in glass `upsilon_(G) = (c)/(n_(g)) = (3 xx 10^(8) ms^(-1))/(1.50) = 2 xx 10^(8) ms^(-1)`


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