diseases. As you saw in Activity 33‚ “From One to Another‚” researchers Alexandre Yersin and Shibasaburo Kitasato independently used the microscope to identify the cause of the bubonic plague. Compound microscopes—microscopes that use more than one lens—were invented around 1595. These first microscopes usually magnified objects only 20–30 times their original size. But as you will learn in the next few activities‚ even this level of magnification was enough to discover a world of new scientific
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Experiment 9: THE TANGENT GALVANOMETER; PURPOSE: In this experiment we will measure the magnitude of the horizontal component of the Earth’s Magnetic field by the use of an instrument called a tangent galvanometer. INTRODUCTION: A tangent galvanometer consists of a number of turns of copper wire wound on a hoop. At the center of the hoop a compass is mounted. When a direct current flows through the wires‚ a magnetic field is induced in the space surrounding the loops of
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Stero microscope low power instrument used in visualizing large objects at low magnification (5-50X); produces unreversed‚ right side up‚ 3-d image; unlike the compound microscope. 1. Prepare slide 2. Turn on transformer 3. Use lowest power lens 4. One eye closed‚ find and focus the object sharply 5. Close eye open the other 6. Keep both eyes open when viewing object Compound microscope Magnifies to about 1000 times with some modification‚ can be increase 2-3 times (but that’s about
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eld Introduc on Some objects are far too small to be seen with the human eye. However‚ by using a microscope many can be viewed in great detail. There are many types of microscopes that range from low–level magni ca on (i.e.‚ hand held magni ca on lens) to very high power magni ca on (i.e.‚ an electron micro scope). In the middle of that range lies the light microscope‚ or for our purposes‚ the compound light microscope‚ which uses mul ple lenses. The compound light microscope (Figure 1) has two
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The magic lantern is an early predecessor of the modern day projector. It consisted of a translucent oil painting‚ a simple lens and a candle or oil lamp. In a darkened room‚ the image would appear projected onto an adjacent flat surface. It was often used to project demonic‚ frightening images in order to convince people that they were witnessing the supernatural. Some slides for the lanterns contained moving parts which makes the magic lantern the earliest known example of projected animation.
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Figure 2.3 shown‚ wherein the line of sight of the telescope is horizontal and the rod is vertical. For the notation i = spacing between stadia hairs‚ c = distance from the instrument center to the objective lens center‚ f = focal length (objective lens to focal point)‚ d = distance from the focal point F to the face of the rod‚ C = (f + c) = stadia constant‚ • for internal focusing telescope‚ C = 0.0 and • for external focusing telescope
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capabilities of the instrument. The number before the "x" represents the magnification power‚ while the number after the letter represents the aperture (or diameter) of the objective lens in millimeters. So a 8x35 binocular‚ for example‚ features a 35 mm lens and can make objects appear eight times closer to you. A 10x50 lens brings things 10 times closer. Dividing the second number by the first produces the value of the exit pupil‚ or the diameter of the light beam which reaches the eye in millimeters
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Using a Compound Light Microscope Purpose: The purpose of this lab is to 1. Learn the parts of a compound light microscope. 2. The functions of those parts. 3. Proper use and care of the microscope. 4. Learn the technique of preparing wet-mount slides. Materials: * Compound light microscope * Soft cloth * Microscope slide * Cover slip * Dropper * Scissors * Newspaper Procedures: Part A. Care of the Compound Light Microscope. Step 1: Always carry
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-Focal adjustment; used to adjust height of stand to adjust closer too or farther from slide. -eyepiece; used to look into to see what is on the slide closer -arm; hold when carrying‚ also used to -objective lenses; must use smallest objective lens‚ they have different levels of magnification. -stand; used to hold up the microscope. -light source; needs to be turned on to be able to see. -base; hold when carrying‚ also used for standing up microscope. 2. 4x=40x ‚ 10x=100x ‚ 40x=400x ‚ 100x=1000x
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object such as virus Objective lens and eyepiece magnifying image Types: light microscope‚ electron microscope (Magnifying glass) [pic] Limited magnifying power-10 to 15 times Use to see small objects Magnifying glass is convex lens (Telescope) [pic] Viewing distant object: stars‚ moon‚ planet Consists of two convex lens- objective and eyepiece lens The image produced by the objective lens magnified by the eyepiece lens (Binoculars)
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