PPT-. Diffraction II Physics 2415 Lecture 38

Michael Fowler UVa Todays Topics Multislit interference The diffraction grating spectra Waves and particles more diffraction Radio astronomy Light Intensity Pattern from Two Slits We have two equalstrength rays phase shifted by. Introduction to Experimental Physics I . . Instructor: . Karine. . Chesnel. . Office: N319 ESC . Tel: 801- 422-5687 . kchesnel@byu.edu . Office hours: on appointment . . Class website:. http://www.physics.byu.edu/faculty/chesnel/physics145.aspx . g Basic Crystallography g Why Use Diffraction in the TEM? g Bragg’s Law g Selected Area Electron Diffraction 1 2 Crystal Structure  A crystal structure is defined as a regular arrang PHYS 2023. Tim Freegarde. 2. Wave propagation in changing media. Huygens’ construction. gradual change:. refraction. refraction; continuity conditions. obstacles:. 1-D: boundary conditions. 2/3-D: diffraction. By Cade Grigsby. 1. What can X-ray diffraction tell us?. Structure. Bonds. Length. Type. Arrangement. Geometry of crystal. Picture. Electron density map. Diffraction. Angle. Intensity. 2. From X-Rays to Structure. - 33 Diffraction of Light Key Points • Diffraction by a Single Slit • Diffraction in the Double - Slit Experiment • Limits of Resolution • Diffraction Grating and Spectrosc History. 1895. Wilhelm Conrad R. ӧ. ntgen. discovered . X-rays. 1905 . Albert Einstein introduces the concept of photons (concept not accepted until 1922). 1913 . Max von . Laue, . Walter Friedrich . Introduction I. History. 1895. Wilhelm Conrad R. ӧ. ntgen. discovered . X-rays. 1905 . Albert Einstein introduces the concept of photons (concept not accepted until 1922). 1913 . Max von . Michael Fowler, . UVa. Today’s Topics. A bit more about mirrors…. Refraction. Lenses. Ray tracing to locate image. Concave Mirror Focusing Sunlight. This solar collector is really many small flat mirrors, but equivalent to a concave mirror focusing parallel rays to a point half way from the center of the mirror to its center of curvature.. Michael Fowler, . UVa. Today’s Topics. Huygens’ principle and refraction. Snell’s law and applications. Dispersion. Total internal reflection. Huygens’ Principle. Newton’s contemporary Christian Huygens believed light to be a wave, and pictured its propagation as follows: at any instant, the wave front has reached a certain line or curve. From every point on this wave front, a . Michael Fowler, . UVa. Today’s Topics. Dimensions. Wave types: transverse and longitudinal. Wave velocity using dimensions. Harmonic waves. Dimensions. There are three fundamental units in mechanics: those of mass, length and time. . Michael Fowler, . UVa. Today’s Topics. Mention of AC. Semiconductors and superconductors. Battery . emf. , internal resistance. Series and parallel resistances. Kirchhoff’s rules. AC and DC. Batteries. Michael Fowler, . UVa. Today’s Topics. Electric motors and galvanometers. Ratio of charge to mass for an electron. Hall Effect. Mass spectometry. Reviewing Essential Facts:. The force on an element of current in a wire in a magnetic field is:. Michael Fowler, . UVa. Today’s Topics. General form of Faraday’s Law. Self-Inductance. Mutual Inductance. Energy in a Magnetic Field. Faraday’s Law: General Form. A changing magnetic flux through a loop generates an emf around the loop which will drive a current. The emf can be written:. Michael Fowler, . UVa. Today’s Topics. The . lensmaker’s. formula. Magnifying power. Lens combinations: ray tracing, telescopes.. Refraction at a Spherical Surface. Rays close to the axis (“paraxial”) will focus to an image inside the glass:.