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Single Slit Diffraction Minimum Angle Calculator

sin(θ_m) = mλ/a — dark fringe positions.

Calculates the angular positions of diffraction minima (dark fringes) for single-slit Fraunhofer diffraction. Each order m gives a dark band at sin(θ) = mλ/a.

Marcus Laurent By Marcus Laurent
Published Last reviewed 1 min read

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How to use this calculator

  1. Fill in the inputs above using the units you already have.
  2. Values update automatically as you type — no submit button needed.
  3. Hover any result row for the underlying formula and intermediate values.

Formula

sin(θ_m) = m × λ / a; θ_m = arcsin(mλ/a) in degrees

In depth

Calculates the angular positions of diffraction minima (dark fringes) for single-slit Fraunhofer diffraction. Each order m gives a dark band at sin(θ) = mλ/a.