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Question

The device which produces highly coherent sources is

A
Fresnel bi-prism
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B
Young's double slit
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C
LASER
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D
Lloyd's mirror
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Solution

The correct option is C LASER
Two sources are said to be coherent if they have exactly same frequency, and have zero or constant phase difference.
Laser is a coherent source i.e. constituent multiple sources inside the laser are phase-locked.
Hence laser produces highly coherent sources.

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