What is a microscope with one than more lenses called?
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I believe that you are referring to a stereo-microscope. Generally stereo-microscopes have low magnification and are used for the study of macroscopic 3-dimensional objects like insects. Hope this helps.
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Most light microscopes (or at least the ones I used) have a "arrow" in the eye lense that can measure specimens if aligned correctly. It also varied on magnification.
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Try a Yahoo search for parts of a microscope\n\nFound several sites that look useful:\n\nAn online "flashcard" quiz to practice naming the parts:\n\nhttp://biologycorner.com/microquiz/\nhttp://www.cas.muohio.edu/~mbi-ws/microscopes/microscopeparts.html\n\n\nDiagrams with labels:\n\nhttp://www.usoe.k12.ut.us/curr/science/sciber00/7th/cells/sciber/micrpart.htm\nhttp://www.middleschoolscience.com/scope.htm
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Microscopes have allowed scientists to view organisams no visible to the naked eye. By doing so we have learned about diseases, cures, and causes.
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Yes.  A diverging lens "demagnifies"  It makes objects smaller rather than larger.  These are used for people who can't see far off.
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In a compound microscope the objective does not have a single lens but a number of lenses. \nA single lens has chromatic and spherical aberration. Both limit the resolving power of the lens. If you combine several lenses you can correct for spherical and chromatic aberration. \nIn addition the projected image of a single lens is not flat but curved. As it is commonly projected onto the flat back of a camera to record the image that will obviously cause problems. Using more than one lens it is possible to correct for that as well. \nAll you ever wanted or needed to know about microscope optics can be found at the link below.\nBy the way, you don't need compound lenses to achieve a higher magnification. But the higher the magnification, the more severe are the aberrations of a lens.
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electron microscope\nn.\nAny of a class of microscopes that use electrons rather than visible light to produce magnified images, especially of objects having dimensions smaller than the wavelengths of visible light, with linear magnification approaching or exceeding a million (10 to th power 6).\n\nA device that uses electrons instead of light to form images of very small objects, such as individual parts of small living things. \n\na microscope that is similar in purpose to a light microscope but achieves much greater resolving power by using a parallel beam of electrons to illuminate the object instead of a beam of light\n\nThe electron microscope is a microscope that can magnify very small details with high resolving power due to the use of electrons as the source of illumination, magnifying at levels up to 2,000,000 times. \n\nHistory \nThe first electron microscope was built by the German physicist Ernst Ruska. He knew that electrons possess a wave aspect, so he believed he could treat them in a fashion similar to light waves. Ruska was also aware that magnetic fields could manipulate electrons, possibly focusing them as optical lenses do to light. After confirming these principles through research, he set out to design an electron microscope. Ruska had deduced that an electron microscope would be much more powerful than an ordinary optical microscope, because he knew that magnification increased with shorter wavelengths. Since electron waves were shorter than ordinary light waves, it followed that they would allow for greater magnification. In 1933 Ruska and a collaborator, German physicist Max Knoll, under whom he obtained his doctorate, built the first crude electron microscope. Despite the fact that it was primitive and not fit for practical use, the instrument was still capable of magnifying objects 400 times. Ruska was later awarded the Nobel Prize in 1986 for its invention. \n\nThe first practical electron microscope was built by Eli Franklin Burton and students, Cecil Hall, James Hillier and Albert Prebus, at the University of Toronto, Canada in 1938. \n\nAlthough modern electron microscopes can magnify an object 2 million times, they are still based upon Ruska's prototype and his correlation between wavelength and magnification. The electron microscope is an integral part of many laboratories. Researchers use it to examine biological materials (such as microorganisms and cells), a variety of large molecules, medical biopsy samples, metals and crystalline structures, and the characteristics of various surfaces. \n\nTypes \nElectron beam micmroscopes \nTransmission Electron Microscope (TEM) \nThe Transmission Electron Microscope (TEM) involves a high voltage electron beam emitted by a cathode and formed by magnetic lenses. The electron beam that has been partially transmitted through the very thin (and so semitransparent for electrons) specimen carries information about the inner structure of the specimen. The spatial variation in this information (the "image") is then magnified by a series of magnetic lenses until it is recorded by hitting a fluorescent screen, photographic plate, or light sensitive sensor such as a CCD (charge-coupled device) camera. The image detected by the CCD may be displayed in real time on a monitor or computer. \n\nResolution of the high-resolution TEM (HRTEM) is limited by spherical and chromatic aberration, but a new generation of aberration correctors has been able to overcome spherical aberration. Software correction of spherical aberration has allowed the production of images with sufficient resolution to show carbon atoms in diamond separated by only 0.89 ångström (89 picometers) and atoms in silicon at 0.78 ångström (78 picometers) at magnifications of 50 million times. The ability to determine the positions of atoms within materials has made the HRTEM an indispensable tool for nano-technologies research and development in many fields, including heterogeneous catal
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Coarse adjustment is used to focus the image on the microscope under low or medium power by using larger motions of the lens. (Note: Coarse adjustment should never be used during High power)\n\nFine adjustment is used to focus the image on the microscope of only high power by using very tiny motions of the lens.
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No, the condenser is what focuses your light source onto the specimen.  The eyepiece is what you look through.
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It's all about refraction ( a fancy term which means bending light)... The lenses in the microscope bend the light before it enters your eye so that it looks as though it comes from a much bigger object. Draw a horizontal line and put a dot on the left of the line to indicate your eye. On the right of the line put a vertical stick (so its base is on the line).  Now join the top of the line to your eye. That's a light ray entering your eye from the top of the stick. Now make the stick much bigger. and do the same thing. Notice that as the stick gets bigger the angle between the horizontal line and the light ray from the top of the stick and your eye gets bigger too. If you can change the angle as light enters your eye things will look biger. That's what the lens does.
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Humphrey Microscope.\n\nSeriously, it's usually credited to Leewenhoek.
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The Focal Length (distance from the Focal Point to the lens) is VERY different.  The Focal Point of a Telescope may be very far away.  But the Focal Point of a Microscope may be only a fraction of an inch away.\n\nAlso, the Telescope has a much larger aperature (lens diameter) to allow it to capture the tiny amount of natural light at the Focal Point.  A microscope usually illuminates the Focal Point with artificial illumination.\n\nHere's a good discussion of Focal Point and Focal Length:
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1) *more info?\n2) microscopy\n3) electron
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a stereoscope in general lets you see a picture in "3D" by projecting two slightly different images into your eyes. In biology a stereoscopic microscope is the one with two eyepieces
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converging lens  forms a magnified and virtual  image of an object situated close to the lens (between the focus point and the lens).
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Yes.   There are many different types of microscopes.  Fluorescent microscope is one of them.
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Most microscopes for fluorescent techniques can also be used for regular optical viewing.  Just make sure that the exact model you get has both types of light sources that you require.