The refractive indices for glass and water are 3/2 and 4/3, respectively. The refractive index of glass with respect to water is:
Answer & explanation
Correct answer: option 3
The correct answer is Option (3) → 9/8
The relative refractive index of medium 2 with respect to medium 1 is \( n_{21} = n_2/n_1 \). Here medium 2 is glass and medium 1 is water.
\( \displaystyle n_{gw} = \frac{n_g}{n_w} = \frac{3/2}{4/3} \)
\( \displaystyle n_{gw} = \frac{3}{2} \times \frac{3}{4} = \frac{9}{8} \)