Question

write any two rules of refraction of light through lens

Answer 1

angle of incidence is equal to angle of refraction angle of incidence angle of refraction and the normal at the point of incidence lie on the same plane

Answer 2

laws of refraction-

First law of refraction- It states that incident light ray,refracted light ray,normal ray meet at same point of incidence  on the same plane.

Second law of refraction or snell's law- It states that the ratio of sine of incidence is to sine of refraction is always equal to refractive index (denoted by n) provided that-

1) pair of medium

2) colour of the light should be same