Q. 5

A simple microscope is rated 5 X for a normal relaxed eye. What will be its magnifying power for a relaxed farsighted eye whose near point is 40 cm?

Answer :

Given data-


Near point of the relaxed farsighted eye,D = 40cm


Magnification of microscope, m = 5


Least distance of distinct vision for a normal eye = 25cm


For relaxed eyes, the image will be formed at infinity.


Hence, the magnifying for m for simple microscope for normal adjustment (normal eye) will be-




Now, for a relaxed far sighted eye with D=40cm, the magnifying power will be-




Hence, the magnifying power of simple microscope for far sighted eye will be 8X


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