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**# of diffraction orders seen???**

**1. Homework Statement**

A 513 line/mm diffraction grating is illuminated by light of wavelength 567 nm. How many diffraction orders are seen?

**2. Homework Equations**

**3. The Attempt at a Solution**

d*sin theta = mt

t = wavelength

m = d*sin theta/t

I don't have the angle so I just omitted it assuming it would be very small and I did...

m = d/t = 3.4 so 3 diffraction orders

Is this correct?