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Asked Dec 19, 2019
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White light is spread out into its spectral components by a diffraction grating. If the grating has 2.00 x 103 lines/cm, at what angle does red light of wavelength 6.40 x 102 nm appear in the first - order spectrum?

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Given that the number of lines per centimeter N = 2050lines/cm The grating element is given by %3D d = 2050lines/cm d = 5.000×10*cm d = 5.000×10-° m For first order diffraction , d sin e = 1 sin e 640 ×10-9 sin 0 = 5.000 x10 m sin e = 0.128 e = sin- (0.128) 0 = 7.354° %3D

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