Answer:
The width of the central bright fringe becomes narrower.
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 between screen and slit
a= slit width
[tex]\lambda = wavelength[/tex]
Thus if Screen width increases keeping other factors same then width of cental fringe becomes narrower as
[tex]x_c\propto 1/a[/tex]
The width of the central bright fringe becomes narrower.
