The experiment at the heart of quantum weirdness. See how two slits create bright and dark interference fringes, shaped by each slit's diffraction envelope.
Double-Slit ExperimentLive
wave interference + diffraction
Controls
The iconic experiment: two slits create interference fringes, modulated by each slit's diffraction envelope.
Reading this result: Two-slit interference sets the fine fringe spacing (∝ λ/d) while single-slit diffraction sets the envelope (∝ λ/a); here about 10 bright fringes fit under the central peak.
Runs locally in your browser — free forever. Scale to the cloud when reality gets heavy.
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How it works
The screen intensity combines two-slit interference, cos²(πd·sinθ/λ), with the single-slit diffraction envelope, sinc²(πa·sinθ/λ). Change the slit separation, slit width, and wavelength to watch the fringe spacing and envelope respond exactly as in the real experiment.
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The math, the assumptions, real-world uses, or a code translation — explained for this exact simulation.
Yes. Double-Slit Experiment runs entirely in your browser using your device's own compute, so local use is free forever. You only pay Compute Tokens if you scale a job to the cloud.
Do I need to install anything?▾
No. Everything runs client-side in a modern browser — no downloads, no license, no account required to start.
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Create a free account to save projects, and use a shareable embed or minted DOI to publish a live, interactive version anywhere.
How accurate are the results?▾
The solver uses established numerical methods, but results are for research and educational purposes and should be validated against experiment or professional review before you rely on them.