Easy to use, cheap but lower magnification and a low resolution of just 0.2 micrometres so anything less you will not be able to see
Electron microscope
Expensive, hard to use but uses electrons instead of light, maximum resolution of 0.1 nanometres
Light path in light microscope
Light from room will hit upwards to the stage through the objective lens to the eye, lenses spread out light rays so image we see is larger than the object
Magnification
image size\ object size
Organ system
Group of organs that are present in an organism that carry out specific jobs