Ch7 Cell Structure: Microscope Flashcards
What are the microscopes used in school
Compound microscopes (uses two lenses)
Aka light microscope (uses light to show the image)
Calculate magnification
Multiple power of the two lenses
Total magnification
Eyepiece lens 10x
Objective lens 40x
10 x 40 = 400
Eyepiece lens vs. Objective lens
Eyepiece. The one you look through
Objective. One directly above the speicmen
3 objective lens
-scanning lens (4x)
-low power lens (10x)
-high power lens (40x)
Lenses
To magnify
Stage
To place the slide on
Clips
To hold the slide in place
Diaphragm
Controls the amount of light
Coarse focus
To focus the image
Fine focus
To precisely focus the image
Light
To light the object
Two types of electron microscopes
Transmission electron microscope
TEM
scanning electron microscope
SEM
Electron microscope
Uses a beam of electrons instead of light
Why are electron microscopes better than light ones
Electrons have a shorter wavelength than light
Better resolution and higher magnification
