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The refractive index of glycerine is 1.46. What is the speed of light in air if its speed in glycerine is `2.05 x 10^(8) m//s` ?

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Correct Answer - `2.99 xx 10^(8) m//s`
Here, `.^(a)n_(g) = 1.46, v_(g) = 2.05 xx 10^(8) m//s, v_(a) = ?`
From `.^(a)n_(g) = (v_(a))/(v_(g)), v_(a) = .^(a)n_(g) xx v_(g) = 1.46 xx 2.05 xx 10^(8)m//s = 2.99 xx 10^(8)m//s`.

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