Dispersion & Prism
White light decomposed by wavelength-dependent refractive index — Cauchy and Sellmeier equations
Glass Type
BK7
SF11
FK51
LF7
Custom
Sellmeier B₁:
1.0396
Sellmeier C₁ (μm²):
0.00600
Prism Geometry
Apex angle A:
60°
Incidence angle θᵢ:
45.0°
Beam spread:
5
rays
Dispersion Data
—
n_d (589nm)
—
Abbe V
—
Δθ (°) spread
—
Min dev θ_d
Sellmeier Equation
n²(λ) − 1 = Σᵢ Bᵢλ² / (λ² − Cᵢ)
Cauchy approx:
n ≈ A + B/λ² + C/λ⁴
Dispersion power δ:
δ = (n_F − n_C)/(n_D − 1)
= 1/V (Abbe number)
Min deviation: θᵢ = A/2