I'm doing a diffraction grating in which it's measured in slits/meter (calculated to be 1.89 x 10-6 m) and I need to convert it to slits/inch. I've done the conversion to inches by multiplying 1.89 x 10-6 times 39.37 inches (# inches in 1 meter) and I get 7.441 x 10-5 inches. I don't know how to go from here and convert it to slits/inch. Can someone please help? Thanks!