Locating dark fringes in a single slit experiment

[ball1313]

How do I use this formula to locate dark fringes in a diffraction slit experiment?

asin(theta)=n(lambda), (n=1,2,3,...)

I know:
a= size of the slit and
lambda= wavelength of light passing through

but theta?
n?

thanks for the help, I really don't remember learning this in physics...

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[dingyibvs]

I don't think the MCAT tests on this, you just need a qualitative understanding of diffraction.