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How do source and images behave as coher...

How do source and images behave as coherent sources?

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(i) In this method, a source and its image will act as a set of coherent source, because the source and its image will have waves in-phase or constant phase difference as.
(ii) The Instrument, Fresnel's biprism uses two virtual sources as two coherent sources and the instrument, Lloyd's mirror uses a source and its virtual image as two coherent sources.
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