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Q.

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

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a

remains constant

b

keeps on decreasing

c

first decreases and then increases

d

first decreases and then becomes constant

answer is C.

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Detailed Solution

IP=Imax(1+cosϕ)=Imax(1+cos 2πyβ). Initially the ratio of intensity decreases as cos 2πyβ is negative but the ratio starts increasing again as cos 2πyβ starts becoming positive.

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