Solved: 11 12 13 14 15 16 17 18 19 20 、 TIME 01 A magnifying glass is an example of which type of [Physics]

Question

11 12 13 14 15 16 17 18 19 20 、 TIME 01 A magnifying glass is an example of which type of microscope? electron microscope scanning microscope compound light microscope simple microscope

Answer

Task 3: Light Microscopes vs. Electron Microscopes_ _ Directions: Use the provided reading to complete the following Venn Diagram comparing light microscopes and electron microscopes. There must be at least 6 differences for each microscope and at least 3 similarities. Compound light microscopes and electron microscopes allow us to study objects too small for the human eye to see. Both types use radiation, either visible light or an electron beam, to form magnified and detailed images of cells and other specimens of interest. The use of both microscopes has allowed us to learn more about cells and cell structure then would otherwise be possible. However, before using either microscope, the specimen to be studied must be properly prepared using appropriate techniques for slicing, staining, and mounting. Electron microscopes, invented in the 1930' s, use beams of electrons instead of rays of light to form highly magnified images of the specimens being studied. The beams of electrons are focused using electromagnets rather than the glass lenses used in light microscopes. Electron microscopes have higher resolution and magnification 1,000,000X or more when compared to light microscopes. The two main types of electron microscopes are the transmission electron microscope TEM, which is used to study interior cell structure, and the scanning electron microscope SEM, which produces 3D-like images of the specimen’s surface. Living specimens cannot be viewed using electron microscopes because electron microscopes require there to be a vacuum within the tube. All specimens studied in the electron microscope are dead. Light microscopes on the other hand can be used to observe both living and nonliving cells and specimens. Light microscopes were invented in the late 1500’s. Some microscopes used only one lens, called simple light microscopes, to magnify the specimens being observed. Anton van Leeuwenhoek used simple microscopes when describing microscopic organisms he called animalcules. Compound light microscopes use a series of lenses to magnify their specimens. Robert Hooke described cork cells using a compound light microscope in the 1600's Although they have lower resolution and magnification 1000 - 2000X, today's light microscopes are smaller and easier to move and use when compared to the much larger, and much more expensive, electron microscope. Also, specimens within the light microscope can be viewed directly. In contrast, electron microscopes require a computer screen or photographic plate to produce an image because electrons cannot be seen by the human eye. The images seen through a light microscope are in color, unlike the black and white images produced by electron microscopes. Images from both microscopes can be photographed and/or printed. Such images are referred to as micrographs. Light microscopes and electron microscopes both have their advantages and disadvantages when it comes to studying cells and other biological materials. However, the use of both microscopes has allowed us to better understand the world in which we live. A-Thom-ic Science 2017. For classroom use only. Do not post online.