Diffraction Grating Bright Spots · CAP 1999 #A21

Physics · optics

Problem

A diffraction grating has 300 "lines" per mm etched upon it. When light of wavelength 550 nm is normally incident upon the grating, how many bright spots appear on a screen a short distance away? (a) 1 (b) 6 (c) 12 (d) 13

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