Problem 33-17a: What minimum path length is needed to introduce a phase shift of 125° in light of wavelength 550 nm? (Gi

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Problem 33-17a:
What minimum path length is needed to introduce a phase shift of
125° in light of wavelength 550 nm? (Give your answer in nm.)
Problem 33-17b:
What phase shift will that path difference you calculated in part
(a) introduce in light of wavelength 720 nm? (Give you answer in
degree.)