Question

The distance between the lenses of a microscope is 18 cm. The focal length of the eyepiece is 1.8 cm. If the microscope is to produce an angular magnification of -260 when used by a person with a normal near point (20 cm from the eye), what must the focal length of the objective be?
Neill
He gave us this in lecture:

L = 0.18m
Fe = 0.018m
M = -260
N = 0.2m
Fo = ?

M = (-N/Fe)(L-Fe/Fo)

Subbed in and I ended up with 6.92x10^-3 m

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