Question

Light from an argon laser strikes a diffraction grating that has 4,917 lines per cm. The...

Light from an argon laser strikes a diffraction grating that has 4,917 lines per cm. The first-order principal maxima are separated by 0.4 m on a wall 1.62 m from the grating. What is the wavelength of the laser light in nm? Enter an integer.

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