Question

Refractive indices of four media P, Q, R, S are $1.33,1.44,1.52,1.65$ respectively. In which of these media is the speed of light maximum?

• A. P
• B. Q
• C. R
• D. S

Answer 1

The correct option is A P

Speed of light ,$v=\frac{c}{\mu }$

where $c$=speed of light in vacuum

and $\mu$ = refractive index of medium

Hence, for maximum speed, $\mu$ should be minimum.

Hence, speed of light will be maximum in P having minimum $\mu$.

Answer-(A).