Question

hi friends... what is law of snell? ​

Answer 1

the ratio of sin of incident angle to that of the reflected angle is always constant.

Answer 2

The Snell's law of refraction states that the sine of angle of incidence to the sine of angle of refraction, when light refracts while going from one medium to another, is equal to a constant known as the refractive index of the second medium.

Or,

refractive index, n = sini/sinr