Laser beam

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A laser beam passes through a single slit of width 0.0186 mm and produces a pattern with an intensity distribution like that shown in Figure 13a (page 208), on a screen 105.6 cm away. If the spacing between the minima on either side of the central maximum is 7.16 cm (in other words, 2y1 in Figure 13b, page 208), the wavelength of the light is ? nm.

I have absolutely no idea how to start this problem. I know that i read something in my textbook about how with intensity of laser beams need to be calculated thru E

wavelength=c/f

E=hf

E=hc/wavelength

h=6.63E-34

but I did not know if I had to/how to use these equations in this problem.
 

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