A) the bright fringes will have unequal spacing.
B) the bright fringes will have unequal brightness.
C) the fringes do not appear.
D) the dark fringes are not perfectly dark.
Correct Answer: D
Solution :
: When the slits are of unequal widths, \[{{I}_{1}}\ne {{I}_{2}}\] \[\therefore \] \[A\ne B\] \[{{I}_{\min }}={{(A-B)}^{2}}\ne 0\] i.e., the dark fringes are not perfectly dark.
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