As the magnification of a microscope used is increased, is more or less illumination needed? Explain.?
406370
More light is needed as the magnification is increased since the size of the hole of the objective lens decreases. Try it!
493713
See it through a magifying glass. it will look 'BIGGER'
288946
a double convex lens will magnify, i can't remember which ones reduce size, but i'm guessing some sort of concave lens, and lenses REFRACT light, while mirrors REFLECT light.
765270
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 microscopes, which use beams of electrons instead of light, are designed for very high magnification usage. Electrons, which have a much smaller wavelength than visible light, allow a much higher resolution.\n\nThe scanning electron microscope (SEM) is a type of electron microscope capable of producing high resolution images of a sample surface. Due to the manner in which the image is created, SEM images have a characteristic three-dimensional appearance and are useful for judging the surface structure of the sample.\n\nThere are some great pictures and more info at http://en.wikipedia.org/wiki/Scanning_electron_microscope
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The eye it not limited by distance;\n\nit responds to photons hitting the retina, it does not care how far the photons have travelled.\neg you can see a bright star further away than a dim one because it emits more photons. A telescope serves to collect more photons.\nIn a dark room you cannot see even close objects.
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below i am enumerating the differentiatin points :-\n1)LIGHT MICROSCOPE>>this is also called optical microscope and it uses light as source of illumination.> image here is produced due to selective absorption of light by different parts of object.>this microscope doesn't require vacuum.>it employs ordinary glass lense and doesn't need magnets.> high voltage electricity is not required.>specimen is kept in liquid medium or a resin.>microscope is small n portable.>radiation risk absent.>contrast in image is achieved by use of dyes like fast green safranin.> image of stained specimen is coloured.\n2)ELECTRON MICROSCOPE->>source of illumintn is electron beam.>image obtained due to selective scattering of electrons by diff molecular components of object>image is black n white>no staining>apparatus enclosed in vacuum>glass lenses not used>electromagnetic lenses of high power used>microscope is large n fixed>radiation risk exists>specimen must be completely dry>high voltage current req to generate electron beam>contrast in image is achvd by use of heavy metals like lead acetate n phosphotungstate>spcmn is ultra thin\nand ah yes resolving power of lght mcrscpe is 0.25micrometre-0.3micrometre while\nfor electrn mcrscp, 2-10 angstrom though theoretically should be 0.25 angstrom.
367001
Buy a magnifying glass.
61208
Simplistically, higher frequency light, like UV, would tend to focus closer to the front of the eye. Not on the retina, but somewhere slighty inside the eye in front of the retina. This just means that the UV is slighty ouf of focus - if you could see it.
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they are cheap compare to electron microscope.\nbut there is limitation of zooming large.
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Because of the difference in the index of refraction, with everything else equal, the glass should be brighter because it is less diffuse.\n\n\nhttp://www.findarticles.com/p/articles/mi_rlg4413/is_SLGG0003/ai_n15607430\n\nhttp://www.madsci.org/posts/archives/Jan2003/1042659817.Ph.r.html
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compound light microscope
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It depends on the wavelength of the light and its energy.
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Not in the same way that light reflects. This is an important topic in X-Ray telescopes. See below!
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Magnifying mirrors are concaved inward and work by focusing the light on a point such that the image is larger than the original object.\n\nhttp://physics.bu.edu/py106/notes/Spherical.html
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Focus or reflect light.  Some examples are eyeglasses, telescopes, microscopes, and lasers (including those found in CD players and industrial equipment).  I'm sure you could also find many more uses, if you need them, by doing a search on Google.
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its a lens to a microscope