Question

The speed of light in a medium is 2,40,000 Km/Sec. The refractive index of the medium

is​

Answer 1

Answer:

Speed of light in vacuum = Speed of light in medium X Refractive index of medium

therefore, refractive index of medium = Speed of light in vacuum / speed of light in medium

= 3,00,000/ 2,40,000 = 1.25

Answer 2

Answer:

Given,

refractive index=6/5

speed of light, c = 3,00,000km/s

we know,= c/v

v=3,00,000×5/6

= 50,000×5

= 250000 ans

hope this will help you.....