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?
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