I'm not sure how to go about doing this. Can someone please help? I'll rate you the brainliest!

Calculate the wavelength of the laser light for a) d = 1/500 mm and b) d = 1/1000 mm. Use the modified “grating equation” given below:

nλ = d (X/L)

Remember to keep all calculations in millimeters (mm) until the end and then convert your answer to nanometers (1 nm = 10‐6mm)