The refractive index of a given transparent medium is 1.5 . The speed of light in the medium is equal to

Correct option is B

The correct answer is (b) $$2×10^8 m/sec$$

​​The refractive index (n) of a medium is defined as the ratio of the speed of light in a vacuum (c) to the speed of light in the medium (v).

The formula to calculate the speed of light in the medium is

V= $$\frac{C}{N}$$

Solution:

Refractive index (n) = 1.5

​​Speed of light in vacuum (c) = $$3\times 10^8 m/s$$

v = $$\frac{3\times 10^8 m/s}{1.5}$$

v= 2 $$\times 10^8 m/s$$

So, the speed of light in the medium is ​​2 $$\times 10^8 m/s$$