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What are coherent sources of light?

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What are coherent sources of light? 

What are coherent sources?

Very Short Answer
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Solution 1

Two sources that emit light waves of the same frequency, having a constant phase difference, independent of time, are called coherent sources of light.

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Solution 2

Light or wave sources that produce waves with a consistent phase relationship across time are known as coherent sources. This indicates that the waves' phase difference either stays constant or varies predictably.

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Chapter 7: Wave Optics - Long Answer

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