Answer :

Given data-


Focal length of the objective,


Focal length of the eyepiece,


Image distance from the eyepiece,


Distance between the objective and the eyepiece = 9.8 cm to 11.8 cm


Using lens formula


For eyepiece-




cm


1. When the separation between the objective and the eyepiece = 9.8 cm


for the objective lens, the image will be at a distance





Using lens formula for the objective lens –






Magnifying power of the compound microscope can be calculated as -




When the separation between the objective and the eyepiece is 11.8 cm





Using lens formula for the objective lens –






Magnifying power of the compound microscope can be calculated as -




Hence the magnification lies in the range of 20-30


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