The limits to magnification are low. Magnification increases as the distance
from the object or eye increases, with greater lens thickness and with multiple lenses, but only until the
point is reached where we focus on the lens itself. After that there is
blurring and distortion if not reduction.
The microscope is not constructed to optimise magnification of the slide. The
diameter of the final lens is smaller than that of the pupil (the image would
not disperse), the lens tube must be dimly lit so as not to blur and is too
long (at normal focal length), and our eye and the slide are too close to the
ocular and objective lenses. Instead, we are viewing a projected complex
image of the lens of our eye and an object placed in the microscope, and a simple
image of the stain on the slide.
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