Question

please give me the ans of following ​

Answer 1

Answer:

hey mate your answer is...

Explanation:

light speed=c^2.

index=n

therefore.

$\sqrt{ \frac{c}{n} } .. \\ option \: d..is \: the \: right \: answer \: .. \\ hope \: its \: helps...$

Answer 2

let the medium be v.

refractive index is n.

speed of light is c.

refractive index is equal to the speed of light in vaccum divided by speed of light in that medium.

$n = \frac{c}{v}$

$v = \frac{c}{n}$

therefore option A is correct answer.