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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