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## Homework Statement

The eyepiece of a compound microscope has a focal length of 2.50 cm and the objective has a focal length of 1.5 cm. The two lenses are separated by 17 cm. The microscope is used by a person with normal eyes (near point at 25 cm). What is the angular magnification of the microscope?

a) 283 x

b) 145 x

c) 97 x

d) 113 x

e) 242 x

## Homework Equations

Angular Magnification = Near point / f (eye piece) = 25cm / f (eye piece)

Total magnification = 25cm(s1') / (f1f2)

## The Attempt at a Solution

At first, I just thought it was asking for total magnification and got 113x, which is wrong. I know that the angular magnification is 25 / f (eye piece) so 25/2.5? Clearly not right. Perhaps I need to use the object-image formula (1/s + 1/s' = 1/f) to derive more information, but I'm not sure how. Help would be appreciated =)