Question: Suppose that you have a reflection diffraction grating with n=120 lines per millimeter. Light from a sodium lamp passes through the grating and is diffracted

Suppose that you have a reflection diffraction grating with n=120 lines per millimeter. Light from a sodium lamp passes through the grating and is diffracted onto a distant screen. How wide does this grating need to be to allow you to resolve the two lines 589.00 and 589.59 nanometers, which are a well known pair of lines for sodium, in the second order (m=2)?

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