Optics & Photonics / Subcategory
Wave Optics
Wave optics calculators and formulas for diffraction and interference. Includes double-slit interference, diffraction grating, and fringe spacing calculations.
8Formulas
All levels Difficulty
Updated Jul 2026
← All Optics & Photonics (27) Wave Optics (8)
Fundamental
Fresnel Number
F = a² / (λ*L)
Fundamental
Coherence Length
Lc = λ² / Δλ
Fundamental
Thin Film Interference (Constructive)
2*n*t = m*λ
Fundamental
Optical Path Length
OPL = n * d
Fundamental
Diffraction Limit (Rayleigh Criterion)
θ_min = 1.22 * λ / D
Fundamental
Double-Slit Interference Fringe Spacing
Δy = λ*L / d
Fundamental
Young's Double-Slit Equation
y = mλL / d
Fundamental
Diffraction Grating Equation
d sinθ = mλ