A spectrograph's trihedral prism is manufactured from
glass whose refractive index varies with wavelength as n = A +
where A and B are constants, with B being equal to 0.010 1.tra2.
Making use of the formula from the foregoing problem, find:
(a) how the resolving power of the prism depends on k; calculate
the value of kin in the vicinity of ki = 434 nm and 21,2 = 656 nm
if the width of the prism's base is b = 5.0 cm;
(b) the width of the prism's base capable of resolving the yellow
doublet of sodium (589.0 and 589.6 nm).