A diffraction grating of width 4.00 cm has been ruled with 3 000 grooves/cm. (a) What is

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A diffraction grating of width 4.00 cm has been ruled with 3 000 grooves/cm.
(a) What is the resolving power of this grating in the first three orders?
(b) If two monochromatic waves incident on this grating have a mean wavelength of 400 nm, what is their wavelength separation if they are just resolved in the third order?
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