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How many lines per millimeter are there on a diffraction grating that gives a first-order maximum...

How many lines per millimeter are there on a diffraction grating that gives a first-order maximum for 470-nm blue light at an angle of 250 ?

A) 900 lines/mm

B) 111 lines/mm

C) 8.99 X 105 lines/mm

D)53,000 lines/mm

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