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Double-Slit Diffraction Fringe Spacing Calculator — result sheet
Calculate ideal double-slit fringe spacing from wavelength, screen distance, and slit separation.
Inputs used
Results
Visual chart
Breakdown
Calculation steps
Returned data table
Formula and methodology
Formula: Fringe spacing≈wavelength×screen distance/slit separation.
The page uses the small-angle double-slit approximation and converts the supplied nanometre and millimetre inputs into metres.
This result follows the calculator's declared inputs, precision, validation boundaries, and model limits.
Input contract
- Wavelength — minimum 1.0E-6; maximum 1000000000
- Screen distance — minimum 1.0E-6; maximum 1000000
- Slit separation — minimum 1.0E-6; maximum 1000000
Worked example
| Input | Value |
|---|---|
| Wavelength | 600 |
| Screen distance | 2 |
| Slit separation | 0.5 |
Fringe spacing =0.0024 m.
Assumptions and limits
- Wavelength and slit separation are converted to the same unit.
- The screen is far enough away for the small-angle approximation.
- Finite slit width, envelope intensity, alignment, coherence, and lens effects are not modeled.
Calculator note
Source and methodology
Use the official WorldCalculate methodology policy for the source, formula, precision, and boundary standards behind this calculator.
Planning estimate, not financial, medical, legal, or professional advice. © WorldCalculate — reuse with attribution. Built and curated by Hassan ALRowaie.
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