Question

The ratio of sine of the angle of incidence to the sine of ____________ is a constant.

Answer 1

The ratio of sine of the angle of incidence to the sine of reflection is a constant.

Answer 2

Answer :

The ratio of sine of the angle of incidence to the sine of angle of refraction is a constant.

This is known as Snell's law.

$\frac{ \sin(angle \: of \: incidence) }{ \sin(angle \: of \: refraction) } = constant$

And, this constant is called as refractive index of the medium.

Hope You Got IT