Question

state laws of refraction.

Answer 1

The 2 laws of refraction are as follows :1) First law of refraction state that incident ray , refracted ray and the normal at the point of incidence all lies in a same plane.2) Second law states that ratio of angle of incidence and angle of refraction is constant which is also known as Snell's law.

Answer 2

The following are the laws of refraction of light.

(i) The incident ray, the refracted ray and the normal to the interface of two transparent media at the point of incidence, all lie in the  same plane.

(ii) The ratio of sine of angle of incidence to the sine of angle of  refraction is a constant, for the light of a given colour and for  the given pair of media. This law is also known as Snell’s law of  refraction. (This is true for angle 0 < i < 90deg )

If i is the angle of incidence and r is the angle of refraction, then,

sin  i

-------- =constant

sin  r