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Compound Microscope Parts

A high power or compound microscope achieves higher levels of magnification than a stereo or low power microscope. It is used to view smaller specimens such as cell structures which cannot be seen at lower levels of magnification. Essentially, a compound microscope consists of structural and optical components. However, within these two basic systems, there are some essential components that every microscopist should know and understand. These key microscope parts are illustrated and explained below.

STRUCTURAL COMPONENTS

The three basic, structural components of a compound microscope are the head, base and arm.
•Head/Body houses the optical parts in the upper part of the microscope
•Base of the microscope supports the microscope and houses the illuminator
•Arm connects to the base and supports the microscope head. It is also used to carry the microscope.

When carrying a compound microscope always take care to lift it by both the arm and base, simultaneously.

Ocular with Pointer eyepiece which magnifies image projected by objective
Body Tube maintains the correct distance between the eyepiece and the objectives (usually 25 cm)
Arm
supports the body tube and is used to carry the microscope
Coarse Adjustment a knob that makes large adjustments to the focus
Fine Adjustment a knob that makes small adjustments to the focus
Nosepiece
holds the objectives and can be rotated to change the magnification
Objective Lenses
Adjustable lens system that permits the use of a low power lens, a medium lens, a high power lens, or an oil immersion lens
Low Power
This objective lens provides the lowest magnification
Medium Power
This objective lens provides a medium magnification level
High (Dry) Power
This objective lens provides the second highest magnification
Oil Immersion the use of a drop of oil, that has the same

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