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