The refraction of light on going from one medium to another takes place according to two laws which are known as the laws of refraction of light. These laws are
1.The ratio of sine of angle of incidence to the sine of angle of refraction is always constant for the pair of media in contact.
`sini/sinr=mu=`constant
This constant is called refractive index of the second medium with respect to the first medium. Refractive index is also defined as the ratio of speed of light in vacuum to the speed of light in medium..
2.The incident ray, refracted ray and normal all lie in the same plane.
This law is called Snell's law of refraction.
.(iv) If the refractive index of glass is 1.5 and speed of light in air is `3xx10^(8)` m/s. The speed of light in the gas

Options

A. `2xx10^(8)`m/s
B. `2.9xx10^(8)`m/s
C. `4.5xx10^(8)`m/s
D. `3xx10^(8)`m/s

Answer

A