Biology Microscope Parts and Functions: Support, Light Source, and Focusing

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Last updated 2:48 AM on 9/1/26
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12 Terms

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Base

Support

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Sub-stage light

Source of light

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Stage

Platform slide or specimen rests on, moves via mechanical stage controls (R,L, up, down) (movements are REVERSED. WHY?)

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Condenser

Concentrate the light on specimen (IS A LENS)

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Iris diaphragm lever

Arm / lever controlling an annulus ring that regulates amount of light arriving at the condenser (not visible in this image)

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Coarse adjustment knob

Focus on specimen, gross. ONLY used under 4x / 10x low power objectives

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Fine adjusting knob

Precise focusing (used with high power objectives)

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Head

Objective + ocular lens found

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Arm

Vertical support of head + base

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Ocular

Eyepiece, 10X magnification. The pointer is found inside one of these lenses.

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Nose piece

Contains the three objective lenses

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Objective lenses

Primary lens for viewing specimen