There are two laws of refraction of light. these are :

a) Incident say , refracted ray and normal lie on same plane .

The concept of plane is shown in the image. In terms of x,y and z co-ordinate system , the y-z plane is shown in light sky blue colour.

b) Ratio of sin of angle of incidence and sine of angle of refraction remains constant for a pair of media. i.e.

sin i / sin r = constant (n)

this constant is called refractive index of medium 2 with respect to medium 1.

or we can write

n_{2 } / n_{ 1} = sin i / sin r

Where n_{ 1} is the refractive index of first medium here air. And n_{2 } is the refractive index of second medium here glass.

∴ n_{2 }= n_{1 } x ( sin i / sin r )

If you have any query regarding the laws of refraction then comment below.

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