magnification

increase in the apparent size of an object.

resolution

• clearness of an object.

arm

• supports body tube

base

supports microscope

ocular lens

• in eyepiece, magnifies 10x

body tube

connects nosepiece to eyepiece

revolving nosepiece

holds objectives

scanning power objective lens

sits over the specimen, magnifies image 4x

low power objective lens

sits over the specimen, magnifies image 10x

high power objective lens

sits over the specimen, magnifies image 40-100x

coarse adjustment knob

• moves body tube up and down, gross focus.

fine adjustment knob

• moves tube slightly, sharp focus

diaphragm

adjusts the amount of light passing through specimen

stage

• platform, where slide sits

stage clips

holds the slide in place

light source

bulb or mirror

compound light microscope

Uses a light source to pass through the specimen and an ocular and objective lens to magnify the image

can look at living organisms

magnifies up to 1000x

stereoscope

also called a dissecting microscope

can look at living organisms

uses combo of light and lens

better for 3D surface structures

magnifies 10's to 100'sx

Transmission Electron Microscope

TEM

transmits beam of electrons through the frozen, thinly sliced specimen (special preparation)

Good to look at the insides of cells, cell parts, etc.

magnifies up to 100,000x

Scanning Electron Microscope

SEM

• produces 3-D image when the surface is sprayed with a fine metal coating (gold) and the electron beam is passed over the surface.

• can look at viruses and other external structures

total magnification

the magnification of the ocular lens (10x) x the objective lens