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7 February, 14:34

A light with a second-order dark band forms a diffraction angle of 20.0°. The diffraction grating has 200.0 lines per mm. The wavelength of the light, to the nearest whole number, is nm.

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  1. 7 February, 14:49
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    the correct answer is 684 nm
  2. 7 February, 15:02
    0
    Spacing is a=1mm/200 = 5um.

    a*sin (20) = 2λ

    λ = 5um*0.34202/2 = 0.8550um = 855nm
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