Q. 9

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?

Answer :

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.


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