topic: microscope aim: what are the parts of a microscope?
TRANSCRIPT
TOPIC: MicroscopeAIM: What are the parts of a microscope?
Microscope • Instrument that produces a larger image of an object (specimen) using lenses
Lens•Piece of curved glass • Causes light rays to come together or spread apart
•Magnify an image
SimpleMicroscope
•Uses 1 lens and light to magnify the specimen
CompoundLightMicroscope
•Uses 2 lenses & light to magnify specimen
•Need stain (dye) to see it
Blood
Cheek Cells 40x
Onion Cells 10x
PARTS OF A MICROSCOPE
1. eyepiece
•Ocular lens (usually 10x)
•Lens you look through
2. Objective
lenses
•Contains lenses •Low, medium, high power
Low Power
High Power
•Low power objective = used to locate the specimen on the slide
•Larger field of view (See more of the entire object)
•High power objective =•More magnification•Smaller field of view(see less
of the entire object)
3.Nosepiece
•Holds & rotates obj. lenses
4. Body Tube
•Connects eyepiece to nosepiece
5. Arm•Supports body tube
6. Base
•Bottom = support
7. Stage
•Where slide is placed
8. Stage Clips
•Hold slide in place
9. Mirror/ light
•Illuminates specimen, provides light
10.
Diaphragm
•Controls the AMOUNT of light used
11. CoarseAdjustmen
t Knob
•Larger focusing knob
•For focusing under LOW POWER ONLY
•If used under high power, objective lens and/or slide can break
12. Fine Adjustmen
tKnob
•Sharpens image•Focusing for High
Power
Mostpowerfulmicroscope
•Electron microscope: magnifies up to 1 million times
•Uses beam of electrons instead of light
Fly
Spider
Termite head
Tapeworm
SEM •Scanning Electron Microscope
• Produces real, 3D image• Only scans surface• magnifies 20x - to 200,000x
TEM •Transmission Electron Microscope
•Produces 2D image of thinly sliced organism
•magnifies 1,000x -1,000,000x
Phase ContrastMicroscope
•View living specimens without staining
Light microscope
Phase contrast microscope