11. What is Kohler Illumination? 12. What type of microscope produces a 3-dimens
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11. What is Kohler Illumination? 12. What type of microscope produces a 3-dimensional image? Fill in the blank space 13. When light is passed through the specimen in a microscope, it is called 15. A compound microscope consists of two 16. An opaque object requires 17. Aimage is seen through a compound microscope magnification. (Circle one) tube. under a microscope. at either end of a hollow illumination in order to be viewed and the ocular is 10X. What is the total magnification? 19. What types of samples are analyzed using a Polarized Light Microscope? 20. What is the difference between a polarizer and an analyzer? 21. What is meant by extinction?Explanation / Answer
11. Kohler illumination is a method of specimen illumination used for transmitted and reflected light optical microscopy. Kohler illumination acts to generate an extremely even illumination of the sample and ensures that an image of the illumination source is not visible in the resulting image. Kohler illumination is the predominant technique for sample illumination in modern scientific light microscopy. It requires additional optical elements which are more expensive and may not be present in more basic light microscopes.
12. A scanning electron microscope (SEM) directly produces an image of the three-dimensional.
13.Light traveling up from the mirror passes through the glass slide,specimen, and cover slip to the objective lens. This makes the first magnification: it works byspreading out light rays from the specimen so they appear to come from a bigger object.
14. low magification
15. It consists of two converging lenses.
16. reflected
17. virtual image.
18. objective 20x
ocular 10x
objective 20x *ocular 10x
20 * 10 =200
total magnificance = 200
19. The polarizing microscope or “petrographic microscope” is used mainly in geological studies for geological specimens but also in medicine and biology. This type of microscope differs from the normal one by using a polarized light, in which the light waves vibrate in one direction.
20. Polarizers and analyzers are parts of optical instruments that use plane polarized light. ... The main difference between polarizer and analyzer is that polarizerproduces plane polarized light whereas analyzer can be used to check whether the light has been polarized or not.
21.Extinction of a particular animal or plant species occurs when there are no more individuals of that species alive anywhere in the world - the species has died out. This is a natural part of evolution. But sometimes extinctions happen at a much faster rate than usual.
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