Question

The refractive index of diamond relative to air is 2.42 and that of glass is 1.51

Answer 1

c= speed of light in air/vacuum.

(Speed of light in glass)/(Speed of light in diamond) = (c/1.51)/(c/2.42) = (2.42/1.51) = 1.602.

Light travels 1.602 times faster in glass than in diamond.

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