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3.2: Microscope Components

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    Microscope Components

    The microscope has many components which allow the user to observe microscopic specimens. Study Table 1 and Figure \(\PageIndex{1}\) and Figure \(\PageIndex{2}\) carefully to understand what the function of each component is and its location on the microscope.

    Table 1. Microscope components and their functions.
    Name of component Function

    Binocular portion

    Adjusts the distance between the eyepieces.

    Coarse focusing adjustment

    Adjusts stage height and brings the specimen in focus when the SCANNING OBJECTIVE is used.

    Brightness adjustment knob

    Controls the amount of light from the light source.

    Condenser

    Directs light through the specimen (can be raised and lowered with condenser knob).

    Eyepieces – 10X (ocular lenses)

    Magnify ten times, diopter adjustment ring provides clear focus with both lenses.

    Fine focusing adjustment

    Used for precise focus when LOW and HIGH POWER OBJECTIVES are used.

    Iris diaphragm

    Controls the amount of light through the condenser by moving the aperture diaphragm lever.

    Main switch

    Turns light on or off.

    Microscope frame

    Base to support the microscope.

    Objectives

    Scanning - red (4x), low power - yellow (10x), high power - blue (40x).

    Revolving nosepiece

    Holds objectives.

    Specimen holder

    Secures the slide on stage.

    Specimen holder feed knob (x-axis/y-axis)

    Moves the slide and stage in X- and Y-axes.

    Stage

    Square platform which holds the slide.
    Microscope labeled with key components: specimen holder, stage, condenser, objectives, brightness adjustment knob, and frame.
    Figure \(\PageIndex{1}\) Components of the compound light microscope. (Image by Harmony Folse, licensed under CC BY-SA 4.0)

    Close-up of a microscope showing labeled parts: condenser, aperture diaphragm lever, coarse and fine focusing knobs, and on/off switch.

    Figure \(\PageIndex{2}\) More components of the compound light microscope: The condenser is found underneath the stage. The coarse and fine focusing knobs are found on both sides of the microscope. The on/off switch is found on the left side of the microscope when viewing it from the front. (Image by Harmony Folse, licensed under CC BY-SA 4.0)

    This page titled 3.2: Microscope Components was last modified on Wed, 03 Dec 2025 22:46:48 GMT and is shared under a CC BY-NC-SA 4.0 license and was authored, remixed, and/or curated by Harmony Folse.