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Hello, please answer : Monochromatic light is incident on a diffraction grating of length 77.0 mm and comprising 49 000 lines. The second-order maximum is

Hello, please answer :

Monochromatic light is incident on a diffraction grating of length 77.0 mm and comprising 49 000 lines. The second-order maximum is observed at an angle of 38.8. What is the wavelength of the incident light? Give the answer in nm.

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