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20 terms

Parts of a Compound Light Microscope and Their Functions

STUDY
PLAY
Binocular Tube
Holds 2 eyepieces or oculars
Oculars (eyepieces)
2 Lenses positioned in binocular tube; magnifies image 10x
Diopter adjustment ring
Ring at base of left eyepiece; adjusted according to interpupillary distance
Stand/Arm
Used to carry microscope
Revolving Nosepiece
Revolving plate which holds objective lenses
Objectives
4 lenses which magnify the image
Scanning objective
Magnifies 4x
Low power objective
Magnifies 10x
High (dry) power objective
Magnifies 40x
Oil immersion objective (longest objective)
Magnifies 100x
Stage
Platform containing a central opening; contains a specimen holder with a spring-loaded finger
Mechanical Stage
Device which holds the microscope slide in place and moves it along the stage
Condenser
Group of lenses below the stage in which directs and concentrates the light beam from the lamp to the specimen
Diaphragm lever
Adjusts the amount of light passing through the condenser; controls brightness
Coarse Adjustment Knob
Focuses image by raising and lowering the stage; clockwise=raises stage, counter-clockwise=lowers stage
Fine Adjustment Knob
Small knob in center of course adjustment knob used for final focusing
Base
Bottom support; houses lamp
Lamp
Light source; a tungsten bulb
Voltage control dial or slide
Controls intensity of light from lamp
Power switch
Switch on front which turns on lamp; indicator lamp shines when light is on