A) Bringing the slits close together.
B) Moving the screen away from the slit plane.
C) Replacing the incident light by that of longer wavelength.
D) Introducing a thin transparent slab in front of one of the slits.
Correct Answer: D
Solution :
[d] \[{{\beta }_{w}}=\frac{\lambda D}{\mu d}\] We need to increase \[\beta \Rightarrow D\]increases; d decreases.
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