Physics
Snell Law
Relate angles of incidence and refraction.
n₁ sin i = n₂ sin r
Formula Explanation
Snell’s law governs refraction at a boundary.
Variables Explained
n = refractive index; i = angle of incidence; r = angle of refraction.
Solved Example
Light goes from air (n=1) to glass (n=1.5) at i=30°. Find sin r.
1 × sin30° = 1.5 × sin r → sin r = 1/3.