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You put a grating etched with 300 lines/mm in front of a laser of wavelength 800...

You put a grating etched with 300 lines/mm in front of a laser of wavelength 800 nm. You place a screen 20 cm away from the grating in the path of the diffracted light. How far away from the center of the pattern is the 3rd order (m=3) bright fringe? Give your answer in centimeters. There is no need to enter units.
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