19 terms

7th Grade Science: Cells - microscope

Sci7 Chapter 1-1
STUDY
PLAY
body tube
separates the eye piece (ocular lens) from the objective lens
nosepiece
holds the objective lenses and rotates so students can choose the magnification they wish
low power lens
magnifies at 4x (combined with eyepiece total magnification is 40 power)
medium power lens
magnifies at 10x (with eyepiece total magnification is 100 power)
high power lens
magnifies at 40x (with eyepiece total magnification is 400 power)
stage clips
holds the slide in place
diaphragm
controls the amount of light passing through the opening of the stage
light source
provides light upward toward the stage
eyepiece (ocular lens)
Lens closest to your eye - this is where you look to see your specimen. Magnifies 10x
arm
supports the body tube
stage
supports the slide being used
coarse adjustment knob
used to bring an object into focus when at scanning power
fine adjustment knob
used to sharpen the focus of objects when viewing at high power
base
supports the microscope
Light Path
the way light moves through the lenses and mirrors inside the microscope
Magnification
ability to make things look larger than they are
Total Magnification
combines the magnification power of the objective lens and the ocular lens in a compound microscope
Resolution
clearly distinguish individual parts of an object
(the sharpness of an image)
Cell Theory
idea that...
1. all living things are composed of cells
2. cells are the basic unit of structure and function
3. new cells are produced from existing cells
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