Function single_slit_irradiance_kernel 

pub fn single_slit_irradiance_kernel(
    i0: f64,
    slit_width: Length,
    theta: RayAngle,
    wavelength: Wavelength,
) -> Result<f64, PhysicsError>

Calculates the Single Slit Diffraction Irradiance.

Fraunhofer approximation: $$ I(\theta) = I_0 \left( \frac{\sin \beta}{\beta} \right)^2 $$ where $\beta = \frac{\pi a \sin \theta}{\lambda}$.

Arguments

• i0 - Peak irradiance $I_0$ at $\theta = 0$.
• slit_width - Width of the slit $a$.
• theta - Diffraction angle $\theta$.
• wavelength - Wavelength $\lambda$.

Returns

• Result<f64, PhysicsError> - Irradiance at angle $\theta$.