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## Homework Statement

Monochromatic light illuminates a diffraction grating having 5950 lines/cm. The diffraction angle for the first order image is 18 degrees. what is the wavelength in nm

## Homework Equations

wavelength=D * Sin(Theta

## The Attempt at a Solution

So I know theta is 18, and the D is cm over lines so you have to flip 5950 to 1/5950. What I dont know is does this need to be in nm, or can you leave it in cm. Please explain how to do this for me. Thanks in advance