The magnifying power of a simple microscope is given by , where D is the least distance for clear version. For farsighted persons, D is greater than the usual. Does it mean that the magnifying power of a simple microscope is greater for a farsighted person as compared to a normal person? Does it mean that a farsighted person can see an insect more clearly under a microscope than a normal person?
For a farsighted person, the magnifying power of the lens is given by the ratio of
Where,
D= distance of the object and
f = focal length of the lens
Now, focal length remains same, but the distance D varies for a normal eye and farsighted eye.
Hence, the magnifying power of a farsighted eye will be more than that of a normal eye. Hence the
Farsighted person can see an insect more clearly under a microscope than a normal person.