A student makes a microscope using an objective lens and an eyepiece.

Part A

If she moves the lenses closer together, does the microscope's magnification increase or decrease?

The magnification of a microscope is $M=-\frac{L25cm}{f_0{f}_0}$ so decreasing the tube length $L($while leaving $f_e$ the same$)$ would decrease the magnification.

The magnification of a microscope is $M=-\frac{L25cm}{f_0{f}_e}$ so decreasing the tube length $L($while leaving $f_e$ the same$)$ would increase the magnification.

The magnification of a microscope is $M=-\frac{f_{\text{@}}{f}_e}{L25cm}$ so decreasing the tube length $L($while leaving $f_e$ the same$)$ would increase the magnification.

The magnification of a microscope is $M=-\frac{f_o{f}_e}{L25cm}$ so decreasing the tube length $L($while leaving $f_e$ the same$)$ would decrease the magnification.