11 Drifting Speckles

Aufgabenstellung

Shine a laser beam onto a dark surface. A granular pattern can be seen inside the spot. When the pattern is observed by a camera or the eye, that is moving slowly, the pattern seems to drift relative to the surface. Explain the phenomenon and investigate how the drift depends on relevant parameters.

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Titelbild

"Laser" by Michael Welsh is licensed under CC BY-NC 2.0