To change magnification, point C i.e., objective lens is adjusted.
What is a compound microscope?
A compound microscope is an upstanding microscope with two sets of lenses (a compound lens system) that provide greater magnification than a stereo microscope.
The objective lens is exacerbated (multiplied) by the eyepiece lens, yielding magnifications of 40x, 100x, 400x, and 1000x.
Thus, the objective lens i.e., point C is adjusted to have higher magnification.
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