In a compound microscope, the magnified virtual image is formed at a distance of 
from the eyepiece. The focal length of its objective lens is 
. If the magnification is 
and the tube length of the microscope is 
, then the focal length of the eye-piece lens (in 
) is
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6.25JEE Main 2020
For compound microscope the magnification when final image by eye-piece is formed at 
(least distance for clear vision)
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