Answer:
b.
Explanation:
In case of Single Slit, diffraction will occur.
Then In Single slit Diffraction, width of central fringe is
[tex]x_c= 2D\lambda/a [/tex]
where D= distance b/w screen and slit
a= slit width
\lambda = wavelength
Thus if Screen width increases keeping other factors same then width of central fringe becomes narrower as
[tex]x_c\propto 1/a[/tex]
On increasing the slit width the central bright fringe width The width of the central bright fringe becomes narrower.
