The refractive index of glass for light going from air to glass is 3/2. The refractive index for light going from glass to air will be:
(a) 1/3
(b) 4/5
(c) 4/6
(d) 5/2

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Solution

Answer: (c) 4/6.
Explanation:
Refractive index of material 2 with respect to material 1 is given by:
₁n₂ = $\frac{S p e e d o f l i g h t i n m e d i u m 1}{S p e e d o f l i g h t i n m e d i u m 2}$
By the same argument, the refractive index of medium 1 with respect to medium 2 is given by:
₂n₁ = $\frac{S p e e d o f l i g h t i n m e d i u m 1}{S p e e d o f l i g h t i n m e d i u m 2}$ = 1/₁n₂

₁n₂= 3/2 therefore, ₂n₁= 2/3 = 4/6.
Therefore, the refractive index of light going from glass to air will be 4/6.

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The refractive index of glass for light going from air to glass is 3/2. The refractive index for light going from glass to air will be:(a) 1/3(b) 4/5(c) 4/6(d) 5/2

The refractive index of glass for light going from air to glass is 3/2. The refractive index for light going from glass to air will be:
(a) 1/3
(b) 4/5
(c) 4/6
(d) 5/2