Biological Microscope,Infinity Optical Sys,Achromatic,4x/0.0,WD 21mm,10x/0.25,WD 5mm,40x/0.65 WD 0.66mm,100x/1.25(Oil) spr,WD 0.36mm,Ea

The stage only has room on it for microscope slides, no room for large or bulky specimens.
The only light on a biology microscope comes from beneath the stage.
The magnification of a biological microscope is much higher than that of a stereo microscope.
Magnification is changed by revolving the nose piece so a new objective lens (either 4x, 10x, 40x or 100x) is in place.