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15 Cards in this Set
- Front
- Back
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Bright field illumination |
The most common type of illumination for ordinary microscopy; the object image appears dark against a bright background |
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Condenser |
A lens system that collects the light rays from the lamp and brings them together at one focus; proper condenser adjustment is necessary to enhance contrast, reduce glare, and obtain optimum resolution. |
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Definition |
The clarity and sharpness of the magnified image; the higher the definition, the clearer and sharper the image |
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Depth-of-focus |
The thickness of an object that may be clearly seen at any one time; as magnification increases, the depth-of-focus decreases |
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Field-of-view |
The area seen through the ocular lens when an object image is in focus; as magnification increases, the field-of-view decreases |
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Glare |
Scattered light that results in a loss of image detail; correct adjustment of the aperture diaphragm and condenser usually eliminate the problem. |
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Illumination |
The light that passes from the lamp through the object |
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Immersion oil |
An oil that has the same refractive index as glass; it is used between the 100x objective lens and the object to kerri the rays of light passing from the object to the objective lens lastly parallel, allowing the maximum amount of light to enter the lens. |
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Magnification |
The ratio of the apparent size of an object when viewed through a lens to the size of the object when viewed with the unaided eye; this task is referred to as the power of the lens |
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Parcentered |
The characteristic of a lens system that keeps object detail centered in the field-of-view as different objective lenses are moved into place |
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Parfocal |
Characteristic of a lens system that keeps an object in focus as different objective lenses are moved into place |
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Refraction |
The bending of light rays as they pass from one transparent medium into another of different density |
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Resolution |
The ability of a lens system to discriminate fine detail |
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Total magnification |
The product of magnifying power of the ocular lens and of the objective lens in use |
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Working distance |
The distance between the objective lens surface and the object; as magnification increases, the working distance decreases |
