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19 July, 12:10

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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  1. 19 July, 15:56
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    It is 326 lines per mm
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