The Physics Factbook™
Edited by Glenn Elert -- Written by his students
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|Bibliographic Entry||Result |
|World Book Encyclopedia. Chicago: World Book, 1999: 517-9.||"The best optical microscopes can resolve parts of a specimen that are closer together about 2,000 angstroms."||200 nm|
|Slayter, Elizabeth. Microscope. Grolier Multimedia Encyclopedia Online. Grolier, 1998.||"Under optimal conditions … objects as small as 200 nm can be resolved."||200 nm|
|Cowhig, Jerry. The World Under the Microscope. New York: Bounty, 1974: inside cover.||"The best possible resolution that can be resolved with a light microscope is about 2,000 Angstroms"||200 nm|
|Bunch, Bryan. Electron Microscope. The World Book of Knowledge Encyclopedia. Grolier, 1999.||"Abbe predicted the smallest object that could be seen would be about 2,000 angstroms."||200 nm|
A light microscope is also known as an optical microscope.Optical microscopes are used daily in our lives for example eyeglassesand a simple magnifying glass. To increase the magnification ofa microscope increases the number of lenses. Although sometimesthe image becomes unclear that's when the microscope's resolvingpower decreases. The resolving power is the microscope's abilityto produce a clear image.
In the 1870s, a man named Ernst Abbe explained why the resolutionof a microscope is limited. He said that since the microscopeuses visible light and visible light has a set range of wavelengths.The microscope can't produce the image of an object that is smallerthan the length of the light wave.
Throughout all the research I've done, the value for the resolutionof a light microscope has been constant at 200 nm (2,000angstroms).
Geetika Kumar -- 1999
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