A) Reduce the distance between the slit and screen by half
B) Reduce the distance between the slit and the screen to \[{{\left( \frac{1}{4} \right)}^{th}}\]the original separation
C) Double the distance between the slit and the screen
D) No need to do anything, as the width of the central maxima does not depend on the slit width
Correct Answer: A
Solution :
Width of central maxima \[\beta =\frac{2\lambda D}{a}\] Width of central maxima \[=\frac{2\lambda (D/2)}{(a/2)}\] \[=\frac{2\lambda D}{a}\]
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