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A parallel beam of light (lambda= 5000 Å...

A parallel beam of light `(lambda= 5000 Å)` is incident at an angle `theta=30^@` with the normal to the slit plane in a Young's double slit experiment. The intensity due to each slit is `I_0`. Point O is equidistant from `S_1 and S_2`. The distance between slits is 1mm.

A

the intensity at O is 4Io

B

the intensity at O is zero

C

the intensity at a point on the screen 4mm from O is 4Io

D

the intensity at a point on the screen 4mm from O is zero .

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The correct Answer is:
A
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