Question

The refractive index of glass with respect to air is 3/2. The refractive index of air with respect to glass is : 1 point (a) 3/1 (b) 3/2 (c) 2/3 (d) 1/3

Answer 1

Answer:

HERE IS YOUR ANSWER :-

Refractive index of water wrt air (water n air)= 4/3

Refractive index of glass wrt air (glass n air) = 3/2

Refractive index of glass wrt water ( glass n water) = (glass n air)× (air n water) = (glass n air)× (1/water n air) = 4/3 × 2/3 = 8/9.

My above answer written by me was wrong. The correct answer is not 8/9 but rather 9/8.

Refractive index of water wrt air= 4/3

Refractive index of glass wrt to air = 3/2

Refractive index of air wrt water = 1/(refractive index of water wrt air) = 1/(4/3) = 3/4

Refractive index of glass wrt water = (Refractive index of glass wrt air) × (refractive index of air wrt water) = (3/2) × (3/4) = 9/8.

Therefore Option C

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Answer 2

Answer :

Refractive index of glass wrt air = 3/2

We have to find refractive index of air wrt glass.

◈ What is Refractive index !

Refractive index of medium is defined as the ratio of speed of light in vacuum to the speed of light in medium.

It is an unitless as well as dimensionless quantity.

Refractive index of medium A wrt medium B is given by

• n(AB) = n(A) / n(B)

⇒ n(ag) = n(a) / n(g)

⇒ n(ag) = 1 / n(ga)

⇒ n(ag) = 1 / (3/2)

⇒ n(ag) = 2/3

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