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Two identical radiators have a separatio...

Two identical radiators have a separation of `d=lambda//4` where `lambda` is the wavelength of the waves emitted by either source. The initial phase difference between the sources is `lambda//4`. Then the intensity on the screen at a distant point situated at an angle `theta=30^@` from the radiators is (here `I_0` is intensity at that point due to one radiator alone)

A

`I_(0)`

B

`2I_(0)`

C

`3I_(0)`

D

`4I_(0)`

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The correct Answer is:
B
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