A 109-cm-diameter microscope objective has a focal length, Ask an Expert

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A 1.09-cm-diameter microscope objective has a focal length of 2.4 mm. It is used in visible light with a wavelength of 516 nm.

A) What is the objective's resolving power if used in air?

B) What is the resolving power of the objective if it is used in an oil-immersion microscope with n=1.49?

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