If one of the two slits of a Young's double slit experiment is painted over so that it transmits half the light intensity of the other, then:
A. the fringe system would disappear
B. the bright fringes would be brighter & dark fringes would be darker
C. the dark fringes would be brighter and bright fringes would be darker
D. bright as well as dark fringes would be darker
Case 1: When slit are of equal width, if $I_{0}$ is intensity of light then,
Case 2: When one of the slit is painted over, its intensity would reduce to half then,
Therefore, dark fringes get brighter and bright fringes get darker
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