Question: A diffraction grating is 2 . 6 0 cm wide and contains 3 4 0 0 lines, When used with light of a certain wavelength,

A diffraction grating is 2.60 cm wide and contains 3400 lines, When used with light of a certain wavelength, a third-order maximum is formed at an angle of 21.0. What is the wavelength (in nm )?
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A diffraction grating is 2 . 6 0 cm wide and

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