Question

The refractive indices of glass and water are 3/ 2 and 4/ 3 respectively. The refractive index of glass with respect to water is

• A. 2
• B. 8/9
• C. 9/8
• D. 5/3

Answer 1

Answer: (C)

9/8

Given

$n_{glass}=3/2$

$n_{water}=4/3$

Now refractive index of glass with respect to water is given by

${}_{water}{n}_{glass}$=$\frac{n_{glass}}{n_{water}}$=$\frac{3/2}{4/3}$=$\frac{3\times 3}{4\times 2}$= $\frac{9}{8}$