What is Snell's Law in Vector Form?

In vector form, Snell's Law can be expressed as: n₁ (n̂ × î) = n₂ (n̂ × r̂)

Where:

• n̂ = unit normal vector to the interface
• î = unit vector in the direction of incident ray
• r̂ = unit vector in the direction of refracted ray
• × represents the cross product

This vector formulation is particularly useful in computer graphics and three-dimensional ray tracing applications.