. State the Snell's laws of refraction of light
The Snell’s laws of refraction of light are:
- The incident ray, the refracted ray and the normal at the point of incidence, all lie in the same plane.
- The ratio of the sine of the angle of incidence i to the sine of the angle of refraction r is constant for the pair of given media.
Sin i / sin r = constant 1μ2
where constant 1μ2 is called the refractive index of the second medium with respect to the first medium