PDF-Electron Microscope

An electron microscope is a microscope that uses a beam of accelerated electrons as a source o f illumination As the wavelength of an electron can be up to 100000 times shorter than that of visibl. Different types of microscopes. Objectives. Learners should . be able to:. explain how an electron microscope is different to a light microscope. define the terms magnification and resolution. convert units of measurement used in microscopy. Microscopy is the technical field using microscopes to view samples and objects that can not be seen without unaided eye (objects that are not within the resolution range of the normal eye). There are three well-known branches of microscopy: optical, electron and scanning probe microscopy.. Microscope Review The diagram represents a cell in the field of view of a compound light microscope. In which direction should the slide be moved on the microscope stage to center the cell in the field of view instrument that produces . enlarged . image of . object. Used to study organisms, cells, and cell parts. Increase image . of object . and . S. how object’s details. MAGNIFICATION. : . increase . of . 1590. –first compound microscope. History of the Microscope. 1655 – . Robert Hooke. used a compound microscope to observe pores in . cork.. He called them . “cells”. History of the Microscope. Care. Parts. Focusing. Always carry with 2 hands. Do not force knobs. Always store covered. Keep objects clear of desk and cords. Only use lens paper for cleaning. Microscope Care. Eyepiece. Body. . What Is Microscope?. It is an instrument which deals with too small organisms that they cannot be seen distinctly with the naked eye. Microscopes provide the observer with enhanced . resolution. (ability to observe two nearby objects as distinct objects), . Introduction to the Microscope.  . What Is Microscope?.  . It is an instrument which deals with too small organisms that they cannot be seen distinctly with the naked eye.. Microscope Types. 1. Compound . . Electron microscopy (EM) . is an electron beam which is focused into a small probe across the surface of a specimen . . The first electromagnetic lens was developed in 1926 by . Hans Busch. .. . Rekha. . Unni. Assistant Professor in Chemistry. Christian College . Chengannur. TOOLS FOR MEASURING NANOSTRUCTURE. X-RAY DIFFRACTION (XRD). These analytical techniques reveal information about the crystallographic structure, size, chemical composition and physical properties.. Theoretically a microscope is an array of two lenses Need of M icroscopy Living organisms, cells and their organelles which are too small to be seen with the human eye, can only be seen with the aid To explain the advantages of using an Electron Microscope . To be able to carry out Simple Magnification Calculations. . Science. Learning intention. To know how microscopes have advanced over time and to be able to . compare the advantages and disadvantages of the different types of microscopes.. You will need. •  A pen and paper.. •All living things are made of cells.. •Cells are the basic units of life.. •Cells come only from other cells. . Since the microscope was introduced biologists have examined the structure of living things. In most cases they have been found to be compose of cells. There are however some strange exceptions to the general cell pattern..