What is the effect of decreasing the widths of slits in double slit experiment?

[nicolauslamsiu]

What is the effect of decreasing the widths of slits in double slit experiment?

 

[dauto]

You get more diffraction so the energy spreads more on the screen instead of being concentrated near the center.

 

[nicolauslamsiu]

Will the number of fringes decrease or increase?

 

[dauto]

The number or placement of the fringes doesn't change. Their relative brightness changes. Diffraction is required for light to reach the off center fringes.

 

[BvU]

Study http://hyperphysics.phy-astr.gsu.edu/hbase/phyopt/dslit.html#c1