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Light at wavelength 589 nm from a sodium lamp is incident perpendicularly on a grating with...

Light at wavelength 589 nm from a sodium lamp is incident perpendicularly on a grating with 40400 rulings over width 82 mm. What are the first-order (a) dispersion D and (b) resolving power R, the second-order (c)  D and (d)  R, and the third-order (e)  D and (f)  R?

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