viruses and proteins. The Italians paved the road to the invention of the microscope when they discovered how to grind lenses during the 1300’s‚ and as a result‚ created the first spectacles. The first microscope was developed in 1590 by two Dutch lens grinders and spectacle makers Hans Janssen‚ father‚ and Zacharias Janssen‚ son‚ when they put two grinded lenses inside a tube. Later in the 1700’s‚ many discoveries were made to improve the microscope. One was that lenses combining two types of glass
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light to magnify the image (Figure ). They have a larger diameter lens called the objective lens and a small lens called an eyepiece. Good refracting telescopes utilize multiple lens systems to correct for color aberrations. Chapter discusses lenses in the section on “Stations for Sight”. Reflecting Telescopes Reflecting telescopes utilize one or more concave mirrors for the objective lens to condense the light and a small lens called an eyepiece. Pg3 Conclusion A telescope is an instrument
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EXPERIMENT 7 EXPERIMENT 7 EXP 7: THE FOCAL LENGTH OF A CONVEX LENS BY GRAPHICAL METHOD EXP 7: THE FOCAL LENGTH OF A CONVEX LENS BY GRAPHICAL METHOD ABSTRACT The report is about the focal length of a convex lens using the graphical method. The aim of the report is to determine the focal length of a convex lens using the graphical method. The focal length of an optical system is a measure of how strongly the system converges or diverges light. The method that was used was experimentation
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the two men through the use of these techniques. In Jesus and Jake’s first meeting on the ball court‚ Lee makes use distance and space to increase the sense of separation between them. Empty space here is exaggerated through the use of a wide-angle lens. Jake is seen here in the foreground with Booger‚ Jesus’ cousin and Jesus in the background. If you watch closely‚ all three men keep a healthy distance apart. When Jake approaches Booger to give him love‚ Booger backs away and leaves the court‚ reacting
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air bubbles before the use of the slide. Set the microscope to its lowest power objective lens (x4) and make sure it is in line with the optical tube‚ also that the microscope light is turned on. After preparation of the slide and microscope‚ carefully place the slide onto the microscope stand. Looking from eye-level of the stand‚ lower the tube using the coarse focus know until the end of the objective lens is just about the slide (ensure you do this with care as to not break the slide). Look through
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Chapter 14 Outline I. Refraction of Light A. Refraction is the bending of light at the boundary of two media. 1. It is caused by differences in the way light travels in the two media a) Light changes speed unequally. (1) One side of the light becomes slower/faster 2. If light is perpendicular to the new medium‚ light will not refract a) If the media have the same index of refraction‚ light will not refract B. Index of Refraction 1. How well light travels through a medium is measured by
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ocular micrometer constant‚ the objective lens constant can be known from the product of the ocular micrometer constant and the eyepiece magnification. The magnification of the illustration can be derived using the monocot root slide. Finally‚ when these constants are obtained‚ the magnification of the drawing is obtained. After calibration and computations‚ the following findings have been derived: Ocular micrometer constant 0.01 mm Objective lens calibration 1 mm Size of metaxylem 11
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background ( 3). It has two lenses the objective and the ocular and they create the image by working together. Light pass through the specimen by a light source which is located on the base and is focused by the objective lens which can magnify from 4 to 100 times‚ then the ocular lens further magnifies the image by 10 times. The total magnification is calculated by multiplying the objective and the eyepiece magnification together (3). When a ray of light passes from one medium to another‚ refraction
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LAB 4 Read over the parts of the microscope and answer the following questions: 1. What do you call the lens you look through on the microscope? Ocular 2. What is the difference between the ocular lens and the objective lens? Ocular lens is the lens you look through and objective lens is the lens that is close to the stage. 3. Where do you place the slide on the microscope? the stage under the stage clips 4. Which adjustment‚ course or fine‚ do you use when you are observing the
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phrase in the blank to make the statement true. | 1) The microscope lens may be cleaned with any soft tissue.False. The microscope lenses should clean with a lens cleaner solution and a lens paper due to possible minerals or deposits on the any soft tissue. | | 2) The coarse adjustment knob maybe used in focusing with all objective lenses.False. The coarse adjustment knob should be used during scanning objective lens (lowest power). When it comes to higher objective lenses‚ the fine-focus
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