double-slit experiment
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[edit]![](http://upload.wikimedia.org/wikipedia/commons/thumb/c/cd/Double-slit.svg/220px-Double-slit.svg.png)
![](http://upload.wikimedia.org/wikipedia/commons/thumb/3/39/Young%27s_slits.jpg/220px-Young%27s_slits.jpg)
Noun
[edit]double-slit experiment (plural double-slit experiments)
- (physics) An experiment demonstrating that light and matter can satisfy the seemingly incongruous classical definitions for both waves and particles, regarded as evidence for the fundamentally probabilistic nature of quantum mechanics. A coherent light source, such as a laser beam, illuminates a plate pierced by two parallel slits, and the light passing through the slits is observed on a screen behind the plate, where the wave nature of light causes bright and dark bands due to interference.