The spacing of ruled lines on a diffraction grating is 1,638 nm. The grating is illuminated at normal incidence with a parallel beam of white light in the 391.6 nm to 700 nm wavelength band. The angular width of the gap between the first order spectrum and the second order spectrum is closest to (in degree):
The spacing of ruled lines on a diffraction grating is 1,638 nm. The grating is illuminated at normal incidence with a parallel beam of white light in the 391.6 nm to 700 nm wavelength band. The angular width of the gap between the first order spectrum and the second order spectrum is closest to (in degree):
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Transcribed Image Text:The spacing of ruled lines on a diffraction
grating is 1,638 nm. The grating is illuminated
at normal incidence with a parallel beam of
white light in the 391.6 nm to 700 nm
wavelength band. The angular width of the
gap between the first order spectrum and the
second order spectrum is closest to (in
degree):
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