A light microscope that has an objective lens of x 10 and an ocular lens of x 20 has a magnification of?
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b. 200.\n10 x 20 =200.\nThis is how you get the total magnification by multiplying the individual components.
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Cidar wood oil and lens in compound microscope have the same refractive index. So the oil is used. Magnifying power is the same with any medium.
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It's because of its better resolution NOT magnification. Magnification is just the number of times the image is larger than the object.\n The Resolution however can be defined as the ability to distinguish between two seperate points.If two seperate points cannot be resolved , they will be seen as 1 point. Excited elecrons behave like electromagnetic waves and have a much shorter wavelength than the shortest wavelength of visible light.. therefore have a higher resolution , as a result the nuclear envelope , nuclear pore, the double membrane of mitochondria ..etc can be seen with the electron microscope even with the same magnification of the light microscope...
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its the scale of magnification, 10 mean the image is 10times larger and 50 mean 50 times, the X mean you can adjust between them
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I think the last 2 questions may refer to breakage problems. Since objectives are different lengths, switching from a shorter to a longer one could damage the slide and any part of the lens that protrudes. I guess you'd want to be off the microscope and looking at the slide and objective from the side when you change, to ensure clearance. When you stow the microscope, I'd have the shortest lens in place and the tube cranked all the way up.
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Electron microscopes are used to magnify details up to 500,000 times their normal size. However, due to diffraction, even the best optical microscope (the kind you are probably used to using) is limited to a resolution of 0.2 micrometers. (One micrometer is 0.000001 meter.)
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(m)\n\nField of View or Field Diameter is very important in microscopy as it is a more meaningful number than "magnification".  Field diameter is simply the number of millimeters or micrometers you will see in your whole field of view when looking into the eyepiece lens.  It is just as if you put a ruler under the microscope and counted the number of lines.  \n\nThe chart below will tell you (approximately) what to expect when looking through a microscope with varying combinations of eyepiece and objective lenses.  As an example (in green below), a dual power stereo microscope with 10X eyepiece lenses and 1X and 3X combinations of objective lenses, would have total powers of 10X and 30X and your field of view would be 20 mm and 6.7 mm respectively.  \n\nThis means that an object 20 mm (2 cm, or about 3/4 inch) wide would fill up the whole viewing area at 10X and an object about 6.7 mm wide would fill up the whole area at 30X.  As you can see, having the highest power may not be best for your particular application.  When you move to greater magnifications, you sacrifice field of view.
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Answer D is correct.\n\nYou can verify with a magnifying lens.\n\nWhen a magnifying lens is used to view objects enlarged, the virtual image is formed at the back of the lens\n\nA and B are partially correct and C   is wrong. D is fully correct.
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The parts of the microscope\nAt the top of the microscope is the eyepiece or ocular - a cylinder containing two or more lenses to bring the image to focus for the eye. The eyepiece is inserted into the top end of the body tube. This design allows for different eyepieces to be inserted to give different magnifications. Typical values for eyepieces include X5, X10 and X20. At the lower end of the microscope tube are one or more objective lenses mounted on a circular nose piece. Each objective lens is cylindrical and is screwed into to the nose piece. Typical values of objectives are x5, x10,x20, x40, x80 and x100. Below the objectives is the stage which supports the specimen being viewed. In the centre of the stage is a circular hole through which light shines to illuminate the specimen. Below the stage, the light is provided and controlled in a variety of ways. At its simplest, daylight is directed via a mirror. Most microscopes, however, have their own controllable light source that is focused through an optical device called a condenser with diaphragms and filters available to manage the quality and intensity of the light.\n\nThe whole of the optical assembly is attached to a rigid arm which in turn is attached to a robust U shaped foot to provide the necessary rigidity. The arm is usually able to pivot on its joint with the foot to allow the viewing angle to be adjusted. Mounted on the arm controls for focusing are usually placed, typically a large knurled wheel to control coarse focusing together with a smaller knurled wheel to control fine focusing.\n\nCompound optical microscopes can produce a magnified image of a specimen up to 1000× and, at high magnifications, are used to study thin specimens as they have a very limited depth of field. Typically they are used to examine a smear, a squash preparation, or a thinly sectioned slice of some material. With a few exceptions, they utilize light passing through the sample from below and special techniques are usually necessary to increase the contrast in the image to useful levels (see contrast methods). Typically, on a standard compound optical microscope, there are three objective lenses: a scanning lens (5×), low power lens (10×) or sometimes medium power lens (20x), and high power lens (40×). Advanced microscopes often have a fourth objective lens, called an oil immersion lens. To use this lens, a drop of oil is placed on top of the cover slip, and the lens moved into place where it is immersed in the oil. An oil immersion lens usually has a power of 100×. The actual power or magnification is the product of the powers of the ocular (eyepiece), usually about 10×, and the objective lens being used.
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Yes, by placing a simple microscope close to the eye, the light rays which were diverging from the object are now diverging less or even convering a little before they reach the eye's lens. The far sighted observer's eye does not have to converge the light rays as much and their weaker focussing power is now sufficient to form a focussed image on the retina.
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Stereo microscops ARE light microscopes.\n\nThe 3 main types of microscope are:\n\n* light microscope.\n* transmission electron microscope.\n* scanning electron microscopes.
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An upright microscope looks down at the stage, slide and specimen, and transmitted light travels upward from a mirror located below the stage. An inverted microscope does the opposite. Its optics include a prism so that a person looking down into the microscope sees the view from below the stage. An advantage of the inverted microscope is said to be the ability to view live specimens in a deep covered container (see ref.). The short working distance of the typical objective lens prevents such viewing in the upright microscope. (However some change in the inverted microscope's objective is needed to accommodate container thickness.)
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Bifocals and lightning rod.
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LGP depends on the area of the objective lens/mirror.  Area depends on the square of the diameter.  So take the ratio of their diameters (express them both in the same units first!) and square that ratio - that will be your answer.
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With a conventional bright field microscope, light from an incandescent source is aimed toward a lens beneath the stage called the condenser, through the specimen, through an objective lens, and to the eye through a second magnifying lens, the ocular or eyepiece. Most microscopes will have a built-in illuminator.\n\nI hope that helps
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Thin lenses have longer focal lengths and lower magnification, but also less severe aberrations.
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focal length is one half the radius of curvature, which is 22.5 cm.  the magnification is proportional to the image distance divided by the object distance.  So the image's distance is twice the object's distance from the mirror.  Now, 1/(object distance)+1/(image distance)=1/(focal length).  Or, 1/(2*object distance)+1/(object distance)=1/22.5 cm.  After some algebra, you can find that the object's distance is 3/2 times the focal length, which is 33.75 cm.  Check the math if you like.  You have all of the equations now.