2. Microscope: Used to study items too small to be seen with the unaided “naked” eye Compound light microscope: Uses light to form enlarged image of a specimen One of the most important instruments used by biologists today Handle with care! Always use both hands when carrying microscopes – one hand under the base & one hand holding the arm

3. Magnification: Creates an enlarged image of an object Microscopes magnify using one or more lenses Lenses are called objectives on a microscope Compound microscopes = multiple lenses Determining power of magnification: Different objectives allow for varied powers of magnification Magnifications of objectives of our classroom objectives: Ocular lens = 10x Scanning objective = 10x Low-powered objective = 40x High-powered objectives = 100x

4. A. EYEPIECE: Contains the ocular lens B. NOSEPIECE: Holds high - and low- power objective lenses; can be rotated to change magnification. C. OBJECTIVE LENSES: Magnification ranges from 10X to 100 X D. STAGE CLIPS: hold the slide in place E. STAGE: Supports the slide being viewed F. LIGHT SOURCE: Projects light upwards through the diaphragm, the specimen, and the lenses

5. G. BASE: Supports microscope H. DIAPHRAGM: Regulates the amount of light on the specimen I. FINE ADJUSTMENT KNOB: Moves stage slightly to sharpen the image J. COARSE ADJUSTMENT KNOB: Moves stage up and down for focusing K. ARM: Used to support microscope when carried