1. Theory vs Law Law – a fact Theory – an explanation for the fact Example… – Law = If I throw a apple up into the air, it will fall to the ground. – Theory = Gravity

2. Microscopes Micro = small or tiny Scope = view or to look at Allow us to see small objects clearly 4 Different types

3. Dissecting Microscope Typically used during dissections 2 separate lens Low power 3-D view w/ greater depth perception Light source shines from above

4. Scanning Electron Microscope SEM uses a beam of electrons 3-D image of specimen’s surface Black & White Images Can be Colorized by computer 100,000 times magnification Cannot view living organisms

5. Transmission Electron Microscope TEM transmits electrons through a thin slice 2-D image of specimen slice Higher magnification than light microscope Black & White images Can be colorized by computer

6. Compound Light Microscope Clearly magnify specimens up to 1,500 times Samples are stained Light source shines up through specimen

7. Basic Parts Base = Supports the whole microscope Stage = Platform to support the slide Arm = Holds the objectives above the stage Adjustment knob = – Course = Brings objects into rapid focus – Fine = Brings object slowly into focus Eyepiece = Is attached to the nose piece and contains a lens

8. Basic Parts Nosepiece = Turns to change from one objective to another Objective = Is attached to the nose piece and contains a lens Stage Clips = Holds the glass slide and specimen in place Diaphragm = Regulates the amount of light entering the scope Mirror = Source of light directed into the microscope