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24問 • 1年前

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The ____ contains the ocular lens, which you will be looking through to see the magnified specimens with magnification ranging from 5X to 30X, but 10X or 15X is the most common in use. The ocular lens provides a re-magnified image to see when light enters through the objective lens.

eyepiece lens

It connects the eyepiece and ocular lens to the objective lenses.

eyepiece tube

It connects the eyepiece tube to the base, which you should hold when carrying the microscope.

microscope arm

It provides stability and support for the microscope in its upright position. Typically, it holds the source of light or illuminator.

microscope base

It is a light source that can come in the form of a built-in, low voltage illuminator light or a mirror that reflects an external light source like sunlight.

microscope illuminator

It serves as the platform for slides that hold the specimen in place through the stage clip on either side. Some have mechanical stages with adjustment knobs that allow the movement of slides to achieve more precise positioning.

stage and stage clips

It contains the objective lenses. You can rotate this part by switching objective lenses and adjusting the magnification power.

microscope nosepiece

Generally, microscopes feature three or four objective lenses, with magnification levels ranging from 4X to 100X. Objective lenses are combined with the eyepiece lens to increase magnification levels. Objective lenses are the lenses that protrude downward over the specimen

objective lens

Scanning lens

LPO

10x

HPO

40x

OIO

100x

It prevents users from moving the objectives too close to the slide.

rack stop

Turning the knobs adjusts the distance between the stage and the lens. The coarse adjustment knob is used to bring the specimen into initial focus -- visible but not sharp. The fine adjustment knob is then turned to bring the specimen into sharp focus.

control focus knob

These parts are located under the microscopic stage. The condenser concentrates the light on the specimen, whereas the diaphragm with a small movable lever is adjusted to regulate the entry of LIGHT

condenser lens and diaphragm

– is the measure of the ability to tell two points apart. It describes whether two adjoining points can still be perceived as separate.

power of resolution

– is the product of V objective x V ocular

magnification of a microscope

is the sine of half the angle of the cone of light from each point of the object that can be accepted by the objective multiplied by the index of refraction of the medium in which the object is immersed.

numerical aperture

refers to the distance from the cover glass to the nearest point of the objective.

working distance

refers to the distance between the upper and lower limits of sharpness in the image formed by an optical system. As you stop down the aperture iris diaphragm, the focal depth becomes larger. The larger the N.A. of an objective, the shallower the focal depth

focal depth

This is a number that represents the diameter in mm of the image of the field diaphragm that is formed by the lens in front of it

field number

The actual size of the field of view in mm on the object surface. What did you see when you looked into the microscope? Did you see a polygonal or circular lit area? Of course, a better focus should reflect a circular one.

field of view diameter

does not describe the quality of the image. Magnifying an object without good resolution is called empty magnification, as the image appears larger but no greater detail can be seen

magnification

of a specimen is the function of a two-lens system; the ocular lens is found in the eyepiece, and the objective lens is situated in a revolving nose-piece These lenses are separated by the body tube.

enlargement

philo

ユーザ名非公開 · 100問 · 2年前

philo