Physics for IGCSE & O level - Rays And Waves (Section 6 - No. 5)

What is Snell's Law?

sin i / sin r = refractive index

sin r / sin i = refractive index

sin i * sin r = refractive index

cos i / cos r = refractive index

Snell's Law states that the ratio of the sine of the angle of incidence to the sine of the angle of refraction is equal to the refractive index.