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The microscope objective has marked: 20x; N.A. 0.5; EFL = 9mm and the eyepiece has marked...

The microscope objective has marked: 20x; N.A. 0.5; EFL = 9mm and the eyepiece has marked 12.5x.

a) Calculate the length of the optical tube and the distance between lens, supposed ideal, when the microscope is adjusted to infinity.

b) To put the final image at a distinct vision(near the eye), how much do you have to approximate the instrument to the object, or what distance in the direction of the objective should the eye piece be dislocated?

c) Calculate the magnification in each case.

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