Physics, 27.01.2020 20:31, alaf05160

Light with a wavelength of about 490 nm is made to pass through a diffraction grating. the angle formed between the path of the incident light and the diffracted light is 9.2° and forms a first-order bright band.
what is the number of lines per mm in the diffraction grating?
i really don't know how to do this!

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Light with a wavelength of about 490 nm is made to pass through a diffraction grating. the angle for...