Question

Study the table given below and state the medium in which light ray will travel fastest. Why?

Medium	1	2	3
Refractive Index	1.33	1.5	2.4

Answer 1

We know that $\mu =\frac{c}{v}=$ refractive index of medium

where c is the speed of light in air and v is the speed of light in that medium

$⟹v=\frac{c}{\mu }$

thus, velocity in medium is inversely proportional to refractive index of medium,

this gives, smallest refractive index will give maximum speed

answer 1