Question

calutate the speed of light in water of refractive index 4 by 3 given speed of light​

Answer 1

Question

calculate the speed of light in water of refractive index 4 by 3 given speed of light​

Answer :

Refractive Index :

                Refractive index, also called index of refraction, measure of the bending of a ray of light when passing from one medium into another. ... Refractive index is also equal to the velocity of light c of a given wavelength in empty space divided by its velocity v in a substance, or n = c/v

Formula :

n = c / v

Where ,

n = Refractive Index

c = Speed of light in vaccum

v = Speed of light in medium

So , given n = 4/3 .

We know the value of c.

c = 3 * 10^8 m/s

Let , v = x

=> n = c / v

=> 4/3 = (3*10^8)/x

=> x = 2.25*10^8  m/s

Hence speed of light in water is 2.25*10^8 m/s.