A) If both assertion and reason are true and the reason is the correct explanation of the assertion.
B) If both assertion and reason are true but reason is not the correct explanation of the assertion.
C) If assertion is true but reason is false.
D) If the assertion and reason both are false.
E) If assertion is false but reason is true.
Correct Answer: B
Solution :
When intensity of light emerging from two slits is equal, the intensity at minima, \[{{I}_{\min }}={{\left( \sqrt{{{I}_{a}}}-\sqrt{{{I}_{b}}} \right)}^{2}}=0,\] or absolute dark. It provides a better contrast.
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