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Refraction of light is defined as the bending of light when the light ray passes from one medium to another.

Snell’s law of refraction states that: the ratio of Sine of the angle of incidence to the sine of refraction is constant for a given pair of media. It establishes a relation between angle of incidence and angle of refraction.

It can be expressed mathematically as follows:

Given: The refractive index of air with respect to glass is = 2/3

Refractive index of water with respect to air = 4/3.

Speed of light in glass = 2x10⁸ m/s

Refractive index of air with respect to glass n_ag

V_a = 2x10⁸ m/s

(ii) Refractive index of water w.r.t air = 4/3

n_wa =

On calculating we get velocity of light in water=2.25x10⁸ m/s