Snell’s Law for Reflection and Refraction

Image from Unsplash 

Snell's Law for reflection:

When light is reflected from a surface, the angle of incidence (i) is equal to the angle of reflection (r); mathematically,

i = r

Snell's Law for refraction:

When light passes from one medium to another, the ratio of the sine of the angle of incidence (i) to the sine of the angle of refraction (r) is equal to the ratio of the velocities of light in the two media. This can be mathematically represented as:

sin(i) / sin(r) = v1 / v2

where i is the angle of incidence, r is the angle of refraction, v1 is the velocity of light in the first medium, and v2 is the velocity of light in the second medium.