Function snells_law_kernel 

pub fn snells_law_kernel(
    n1: IndexOfRefraction,
    n2: IndexOfRefraction,
    theta1: RayAngle,
) -> Result<RayAngle, PhysicsError>

Calculates refracted angle using Snell’s Law or returns a Critical Angle error.

$$ n_1 \sin \theta_1 = n_2 \sin \theta_2 $$

Arguments

• n1 - Refractive index of medium 1.
• n2 - Refractive index of medium 2.
• theta1 - Angle of incidence (relative to normal).

Returns

• Result<RayAngle, PhysicsError> - Angle of refraction.

Errors

• PhysicalInvariantBroken - If total internal reflection occurs ($\sin \theta_2 > 1$).