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Interference describes different waves superposing to form a resultant wave of greater, lower, or the same amplitude. Normally, it involves interaction of waves that are correlated (coherent) with each other, either because they come from the same source, or because they have the same or nearly the same frequency. Interference effects can be observed with all types of waves, e.g., light, radio, acoustic, surface, or matter waves.

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How does interference occur in interferometers?

The difference in lengths generates different interference effect (for example, for some differences in lengths, photons should be detected by only one of the detectors). … The arms of each unbalanced interferometers have difference in length greater than the coherence length so that no interference is expected. …
Eduardo Henrique's user avatar