Q. Velocity of light in glass whose refractive index with respect to air is 1.5 is $2 \times 10^{8}\ m/s$ and in certain liquid the velocity of light found to be $2.5 \times 10^{8}\ m/s$. The refractive index of the liquid with respect to air is
A) 0.64
B) 0.80
C) 1.20
D) 1.44
Explanation
(c) $\mu \propto \frac{1}{v} \Rightarrow \frac{\mu_{l}}{\mu_{g}} = \frac{v_{g}}{v_{l}} \Rightarrow \frac{\mu_{l}}{1.5} = \frac{2 \times 10^{8}}{2.5 \times 10^{8}} \Rightarrow \mu_{l} = 1.2$
Reviewed by Dr. Abubacker
Physics Educator & NEET/JEE Specialist
Ph.D. in Physics with 19+ years of teaching experience.