Bio Unit 4 - Microscope Parts

Eyepiece/Ocular Lens

Lenses that you use to see specimens to see your specimen. Usually, it provides a magnification of 10x.

Body

The main section of the microscope (includes eyepiece and objective lenses). Doesn’t include base, illuminators, or focusing block.

Arm

The area of the microscope between the body and tube. Usually when you carry the microscope, you hold onto this.

Nosepiece

The revolving structure that holds the objective lenses. Rotating it allows for the objective lens to switch.

Diaphragm

A disc located under the stage, and has multiple holes. It exists as an adjustment to the light source coming beneath it.

Condenser

A lens system below the stage that is directly attached to the light source, and focuses the light to make it brighter or cleaner.

On/off switch

Turns the microscope on or off, and is located near the bottom of the microscope.

Objective Lens

Lens that are the closest to the object being viewed, and increase the magnification of the object.

Stage

The flat surface that holds the sample.

Coarse Adjustment

The larger adjustment knob that moves the objective lens closer/farther away in large steps. Used for lower magnifications.

Fine Adjustment

The smaller adjustment knob that moves the object lens, and used to fine tune visibility.

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Diaphragm

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Arm

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Stage

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Light Source

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Nosepiece

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Objective Lens

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Coarse Focus

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Ocular Lens

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Base

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Fine Adjustment