To solve this problem we will use the concepts related to Magnification. Magnification is the process of enlarging the apparent size, not physical size, of something. This enlargement is quantified by a calculated number also called "magnification".
The overall magnification of microscope is
[tex]M = \frac{Nl}{f_ef_0}[/tex]
Where
N = Near point
l = distance between the object lens and eye lens
[tex]f_0[/tex]= Focal length
[tex]f_e[/tex]= Focal of eyepiece
Given that the minimum distance at which the eye is able to focus is about 25cm we have that N = 25cm
Replacing,
[tex]M = \frac{25*10}{3*5}[/tex]
[tex]M = 16.67\approx 17\\[/tex]
Therefore the correct answer is C.
