Question: Red laser light from a He-Ne laser = 632.8 nm creates a second-order fringe at 53.2 after passing through the grating. What is the

Red laser light from a He-Ne laser λ = 632.8 nm creates a second-order fringe at 53.2° after passing through the grating. What is the wavelength of light that creates a first-order fringe at 20.6°?

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