Single-Slit Diffraction Minimum Calculator

Convert wavelength and slit width to metres, form mλ/a, and take inverse sine for a feasible positive order. The equation describes minima, whereas a grating equation commonly locates principal maxima. The calculator evaluates only the stated idealized equation and supplied values. It does not infer missing conditions, choose an experimental convention, or certify a measurement. Keep every quantity in the displayed unit and verify the model against the physical setup before relying on the result.

The angle marks an ideal zero of the single-slit intensity envelope, not the width of a physical mark on a screen. Screen distance is unnecessary for angle but is needed for an exact linear position. Numerical precision does not imply experimental accuracy. Compare the output with scale, sign, limiting cases, and an independent source, then account for uncertainty in measured inputs and constants before using it in laboratory, engineering, or safety-sensitive work.

A monochromatic plane wave illuminates one uniform slit and the far-field approximation applies. It excludes finite coherence, nonuniform illumination, aperture defects, near-field behavior, and detector response. The result is educational and is not a simulation, calibration, engineering approval, or safety determination. More complete models may require geometry, material response, boundary conditions, relativistic frames, dispersion, losses, uncertainty propagation, or numerical field solutions not represented by these inputs.