Question

If the refractive index of glass with respect to air is 3/2, what is the refractive index of air with respect to glass?
a.1/2
b. 3
c.1/3
d. 2/3

Answer 1

So correct answer is
d)
Becoz in case 1 its with respect to media 2 now it's revert

Answer 2

Answer:

(d) $\frac{2}{3}$

Explanation:

As we know that,

Refractive index is defined as the ratio of the velocity of the light in the air to that of the medium it is passing through.

$Refractive \ index \ of \ glass \ with \ respect \ to \ air = \frac{1}{refractive\ index \ of \ air \ with \ respect \ to \ glass}$

So,

The Refractive index is given by,

$\frac{3}{2} = \frac{1}{refractive\ index \ of \ air \ with \ respect \ to \ glass}$

So,

$Refractive\ index \ of \ air \ with \ respect \ to \ glass=\frac{2}{3}$

Therefore, the Refractive index of the air with respect to the glass is given by 2/3.