The distance between the ruled lines on a grating is 1900 nm. The grating is illuminated at normal incidence with a parallel beam of white light in the 400 nm to 700 nm wavelength band
What is the angular width of the gap between the first order spectrum and the second order spectrum?
A) 3.3°
B) 4.3°
C) 5.3°
D) 6.3°
E) 2.3°
A
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B. The Boltzmann factor is larger at vp than at 2vp.
C. We know that 
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