Question

what is the refractive index of a substance if light travels through air at3×10.8m/sec on entering in another medium its speed becomes 2×10↑8 m/sec calculate the refractive index of the other medium

Answer 1

this is the answer.................

Answer 2

by dividing the speed of light in air (or vacuum) to the speed of light in the given medium we can find the refractive index of the medium.

$refractive \: index = \: c \div v$
c = speed of light in air or vacuum
v= speed of light in the given medium
hence, ref. index
μ = (3×10^8)÷(2×10^8)
μ = 1.5