Young's Double-Slit Fringe Spacing calculator
Fringe period on a screen from two-slit interference.
Category: Diffraction
Formula: Δy = λ·D / a
Inputs
| Input | Parameter | Unit | Default |
|---|---|---|---|
| Wavelength λ | lam | nm | 633 |
| Slit–screen D | D | m | 1 |
| Slit sep a | a | µm | 200 |
Result with the default inputs
- Fringe spacing Δy: 3.165 mm
- Angular spacing: 3.165 mrad
Open it with your own values: put each input in the address as a parameter, for example /calculators/youngs-double-slit-fringe-spacing?lam=633. A unit other than the listed one goes in <parameter>_unit.
Read more: Wikipedia: Double-slit experiment