Below are four different intensity patterns that result from using for different slit setups.

Match each intensity pattern to the description of the slit(s) which produced them.

For the cases of double slits, the spacing between the slits is always the same.

When talking about wide and narrow, we mean widths that are just slightly wider or slightly narrower than 0.1mm. 

Assume that the wavelength of the laser and the distance to the screen is the same for all the different patterns.