Need Help Solving Physics Problem Regarding Green Light

[tgoot84]

hey so I'm having a lot of trouble on this section of physics.
the question I'm on is:
Green light (546nm) strikes a single slit at normal incidence. what width slit will produce a central maximum that is 2.3 cm wide on a screen 1.42m from the slit?

I've been trying to manipulate Wsin(0)=wavelength and y=Ltan(O), but i can't get anything to work.

I appreciate any help.

 

[barob1n]

I thought maybe I could help, but my physics textbook exploded while I was looking into the details surrounding this question. True story.