A-level Physics/Wave properties/Reflection and Refraction

Laws of reflection

Angle of Incidence = Angle of Reflection

The incident ray, reflected ray and the normal to the surface at the point of incidence all like in the same plane.

Refractive index

When light passes from one material to another the refractive index is the ratio of the speeds of light in the two materials.

Refractive Index = Speed in Air / Speed in Medium

Snell's Law

Snell's law is the simple formula used to calculate the refraction of light when travelling between two media of differing refractive index.

$Refractiveindex=\frac{1}{SinC}$