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10 Cards in this Set
- Front
- Back
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Numerical aperature of both the ? and the ? should be ? for maximum potential.
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The N.A. of both the OBJECTIVE and CONDENSOR should be EQUAL for maximum potential.
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What is the numerical aperature?
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This is the index of the light gathering capacity of an objective or condenser. The larger the number, the more light gathered and the higher the resolution.
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Does the N.A. increase or deacrese when the aperature diaphragm is closed? What does that do to the resolution?
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Decreases N.A., increases rosolution
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Which is better, apochromatic or achromatic?
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Apochromatic
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What is Koheler Illumination?
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Centering and focusing the light source for the max. image quality and highest resolution. Also gives max amount of light and even distribution of light.
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How do you avoid empty magnification?
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Magnification of an object cannot exceed 1000 times the N.A. of the objective
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You cannot use aperture diaphragm to control.....
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Brightness
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What does the field diaphragm do?
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Controls how much light enters the sub-stage condersor and consequently the rest of the microscope.
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How does apochromatic differ from achromatic?
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Apochromatic is a photographic lense with better correction of chromatic and spherical aberration than achromatic.
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What is the purpose of green filters?
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Helps achromatic objectives produce their best images because achromats are spherically corrected for green light.
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