If a broad source is used in interference experiment choose the incorrect statement

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Each set these sources produce it’s own interference pattern which may overlap and cause general illumination

Intensity of bright fringes increases and they become broad

Bright and dark fringes will disappear

A broad source is equivalent to a large number of narrow sources lying side by side

answer is C.

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Detailed Solution

A broad source is equivalent to a large number of parallel narrow slits, lying side by side. As there are many slits, there will be many overlapping interference patterns may be formed. The overlapping will be to such an extent that all traces of a fringe system will be lost. Thus almost even illumination will be observed, There will be no interference pattern seen.

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