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19. Monochromatic light is normally incident on a diffraction grating that has 10000 slits and is 1 cm wide. If the second-order line is deviated at 30 degrees, what is the wavelength of the incident light?
(A) 250 nm
(B) 433 nm
(C) 500 nm
(D) 866 nm
(E) 1000 nm


19. Monochromatic light is normally inci..-阿摩線上測驗