A diffraction grating with 750 slits/mm is illuminated by monochromatic light with an unknown wavelength. A diffraction pattern is observed on a screen located 40.0 cmfrom the grating. The first-order diffraction angle is measured to be 18°.(a) Narrow, brightfringes. Most ofthe screen is dark.GratingLightintensityN²1₁y0m=2m = 1m=0m = 1m=2 How far from the central maximum is the second order maximum? (Give your answer in cm.)Answer: 24.8

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rom the grating. The first-order diffraction angle is measured to be 18° (a) Narrow, bright fringes. Most of the screen is dark. Grating Light intensity N1, m=2 m=1 m=0 m=1 m=2