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So let's say the grating is perpendicular to the light, and the distance from the grating to the light is 1m. The distance from the zero order line (the light source?) and first order line (first maxima on the right?) is .5m. That would mean that theta is 26.6 degrees, correct? And with 1000 lines per cm (1/d), the equation m*wavelength=d*sin(theta) would be as follows:

1*wavelength=(1/1000)*sin(26.6)

making wavelength=4.48*10^-4 cm. Is this correct?

Also, is it possible to find wavelength without d? Because I'm not even sure if we're going to be given it or not.