Function grating_equation_kernel 

pub fn grating_equation_kernel(
    pitch: Length,
    order: i32,
    incidence: RayAngle,
    wavelength: Wavelength,
) -> Result<RayAngle, PhysicsError>

Calculates the diffraction angle for a Grating using the Grating Equation.

$$ d (\sin \theta_m - \sin \theta_i) = m \lambda $$

Solves for $\theta_m$.

Arguments

• pitch - Grating pitch $d$ (distance between grooves).
• order - Diffraction order $m$ (integer).
• incidence - Angle of incidence $\theta_i$.
• wavelength - Wavelength $\lambda$.

Returns

• Result<RayAngle, PhysicsError> - Diffraction angle $\theta_m$.