Physics Question:A diffraction grating has 750 rulings

Subject: Physics /Question
A diffraction grating has 750 rulings / mm, and is used to measurea laser wavelength. The first-order diffraction spots (maxima)occur at plus-minus 52.8 degrees.

A) What is the laser wavelength (in nm)?

B) Can we see this light with our eyes?

C) At this wavelength, how many orders will the grating produce?

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