Question

The refractive index of glass is 1.5.find the velocity of light in glass. (va=3×10^8m/s) ​

Answer 1

Answer:

refractive index = speed of light in air/ speed of light in that medium.

let the speed of light in glass be v

then,

$1.5 = \frac{3 \times {10}^{8} }{v} \\ = > v = \frac{3 \times {10}^{8} }{1.5} \\ = > v = 2 \times {10}^{8}$

so,

speed of light in glass is 2 × 10⁸ km/s.