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In a compound microscope, which lens moves to change the focus point? Does this affect the...

In a compound microscope, which lens moves to change the focus point? Does this affect the magnification?

a) The eyepiece, magnification of the in-focus image doesn't change

b) The objective, magnification of the in-focus image changes

c) The objective, magnification of the in-focus image doesn't change

d) The eyepiece, magnification of the in-focus image changes

Detailed explanation please, type if possible. Thank you!

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