Physics question about diffraction grating and interference!?

Posted on 2017-05-17 18:20:00 in Physics by ROSA

Light passes through a diffraction grating with a slit spacing of 0.001 mm. A viewing screen is 200 cm behind the grating. 
If the light is blue, with a wavelength of 450 nm, at about what distance from the center of the interference pattern will the first-order maximum appear? 
I tried using the equation d*sin(theta)=m*(lambda) and using tan(theta) with y/x but I keep getting ridiculous answers. I just want to know how to set it up...any guidance is greatly appreciated!

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