Question

If the velocity of light in vaccum is 3*100000000 m/s and in another medium M is 0.75 * 100000000 m/s . what is the refractive index of M??

Answer 1

refractive index of 1/refractive index of 2=speed in 2 /speed in 1....so 1/M=0.75/3....so M=4