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18 Cards in this Set

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Base:


Bottom of microscope.


Provides a sturdy flat surface to support and steady the microscope

Substage Light:


Light passes directly up through the microscope

Stage:


platform where slide rests while being viewed.

Condenser:


Small non-magnifying lens,


concentrates light on specimen

Iris Diaphragm Lever:


Shutter in the condenser controls amount of light pass-through.

Course Adjustment Knob:


Of the two knobs on the side of a microscope, it is the largest. It is used to focus on the specimen; it may move either the stage or the upper part of the microscope (in a relative up and down motion).



fine adjustment knob:


small, round knob on the side of the microscope.


used to fine-tune the focus of your specimen after using the coarse adjustment knob

Head body tube: Houses the lenses and the mirror

ARM: Connects body tube to the base.

Ocular:


Magnifies specimen additional 10x.


Is adjustable.


One usually contains a pointer.

Nosepiece:


Revolving structure,


houses objectives,


used to move objectives

Objective Lenses: Maginifies Specimen specific amount indicatted on the objective.

Term: Total Magnification:

To get the total magnification take the power of the objective (4X, 10X, 40x) and multiply by the power of the eyepiece, 10X.

Term: Resolution:

The resolution of an optical microscope is defined as the smallest distance between two points on a specimen that can still be distinguished as two separate entities.

Term: Feild of view

the diameter of the circle of light that you see when looking into a microscope

Term: Work Distance

the distance from the front lens element of the objective to the closest surface of the coverslip when the specimen is in sharp focus.

Term: Parafocal

Objectives stay in focus when magnification is changed

Term: Depth of feild

the range of distance in front of and behind an object focused by an optical instrument