Question: A diffraction grating with 7 8 7 lines per centimeter is illuminated by a He - Ne laser of wavelength 6 3 3 nm .

A diffraction grating with 787 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?
b) What would be the highest order if there were 7870 lines per centimeter?

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