Question

Calculate the speed of light in glass if refractive index of glass is 1.5 and speed of light in vaccum is 3×10^8

Answer 1

Refractive Index is defined as:

$\eta = \frac{\text{Speed of light in vacuum}}{\text{Speed of light in medium}}$

Here, we are given that the refractive index of glass is 1.5 . We can find the speed of light in glass as follows. 

$\eta = \frac{c}{v} \\ \\ \\ \implies 1.5 = \frac{3\times 10^8}{v} \\ \\ \\ \implies v = \frac{3 \times 10^8}{1.5} \\ \\ \\ \implies \boxed{v=2\times 10^8 \, \, m/s}$


Thus, speed of light in glass is $2\times 10^8 \, \, m/s$


Hope it helps
Purva
Brainly Community