Law of Refraction

Snell’s law ray simulation

Angle is measured with the normal
Example: air ≈ 1.00
Example: glass ≈ 1.50
Snell’s law
Angle of refraction (r)
Result
If n₂ > n₁, the ray bends towards the normal. If n₂ < n₁, the ray bends away from the normal.