Question: A diffraction grating with 4 4 5 lines per centimeter is illuminated by a He - Ne laser of wavelength 6 3 3 nm .

A diffraction grating with 445 lines per centimeter is illuminated by a He-Ne laser of wavelength 633 nm.
a) What is the highest order of diffraction that could be observed with this grating?
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b) What would be the highest order if there were 4450 lines per centimeter?

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