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In Young's double-slit experment, the fr...

In Young's double-slit experment, the frist maxima is observed at a fixed point P on the screen. Now, the screen is continously moved away from the plane of slits. The ratio of intensity at point P to the intensity at point O (center of the screen)

A

remains constant

B

keeps on decreasing

C

first decreases and then increases

D

first increases and then decreases

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The correct Answer is:
C
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