## Answers

the second law of refraction- the ratio of sine of angle of incidence and the sine of angle of refraction is constant for a given pair of media called as refractive index.

mathematically, sini/sinr = anb ,a constant (refractive index of medium b with respect to a)

bna = speed of light in b/speed of light in a

if b is vaccum then the constant is c(speed of light in vaccum )