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(a) Why are coherent sources necessary t...

(a) Why are coherent sources necessary to produce a sustained interference pattern ?
(b) In Young's double slit experiment using monochromatic light of wavelength `lamda`, the intensity of light at a point on the screen where path difference is `lamda`, is K units. Find out the intensity of light at a point where path difference is `lamda//3`.

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AAKASH SERIES-WAVE OPTICS-PROBLEMS (LEVEL - I)
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