Assertion (A): In standard YDSE experiment if upper slit is slightly moved downward then central maxima shifts downward.
Reason (R): Fringe width in such case will increase.
Both (A) & (R) are true and the (R) is the correct explanation of the (A)
Both (A) & (R) are true but the (R) is not the correct explanation of the (A)
(A) is true but (R) is false
Both (A) and (R) are false
Solution:
Assertion (A) is true; moving a slit shifts the central maxima in the direction of the movement. Reason (R) is false. Fringe width \(\beta = \frac{\lambda D}{d}\) depends on wavelength, screen distance, and slit separation, none of which change.
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