Question

A ray of light travelling in a medium of refractive index 1.8 enters into a medium with refractive index 1.5. Then the speed of light in the rarer medium will 1. Increase by a factor of 1.5 2. Decrease 3 .Remain same 4. Increase by a factor of 1.2

Answer 1

According to Snell's Law,

Refractive index of a medium X=

v

c

where c is speed of light in air and v is speed of light in medium X.

So, Refractive Index of X=

1.5×10

8

3×10

8

=2