In class, we were given the equation for single slits: asin(theta)=m(wavelength).

How do I solve this without knowing the angle?

Light from a helium-neon laser with a wavelength of A = 544 nm passes through a slit of width a = 0.16 mm and forms a diffraction pattern on a screen located a distance L = 2.5 m behind the hole. The setup of the slit and screen is shown in the image below. At what height y from the center of the screen does the m = 3 dark fringe appear? Q Diffraction pattern on screen Cl(a)y =1.92mm C](b)y=255mm Cl(cy) =29.75mm C](d)y=21.25mm Cll e)'y=0mm