A spectrograph's trihedral prism is manufactured from glass whose refractive index varies with wavelength as n =
Question:
(a) How the resolving power of the prism depends on λ; calculate the value of λ/δλ in the vicinity of λ1 = 434 nm and λ2 = 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).
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