In a Youngs Double slit experiment, first maxima is observed at a fixed point \( \mathrm{P} \) o...

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In a Youngs Double slit experiment, first maxima is observed at a fixed point \( \mathrm{P} \) on the screen. Now the
\( \mathrm{P} \) screen is continuously moved away from the plane of

W slits. The ratio of intensity at point \( \mathrm{P} \) to the intensity at point \( \mathrm{O} \) (centre of the screen)
(1) remains constant
(2) keeps on decreasing
(3) first decreases and then increases
(4) First decreases and then becomes constant
hysics \( W a l l \)
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