In these question, a statement of asertion followed by a statement of reason is given .Choose the correct answer out of the following choices:
Assertion and reason both are correct statements and reason is correct explanation for assertion.
Assertion and reason both are correct statements but reason is not correct explanation for assertion.
Assertion is correct statement but reason is wrong statement.
Assertion is wrong statement but reason is correct statement.
Assertion:In Young's double slit experiment,the two slits are at distnace d apart.Interference pattern is obsreved on the screen .When it is directly opposite to one of the slits a dark fringe is observed.Then,the wavelength of the wave is proportional to the square of th distnce fo the slits.
Reason:For a dark fringe,the i ntensity is zero.

Options

A. A
B. B
C. C
D. D