PPT-Diffraction of Light By definition, diffraction refers to the apparent bending of waves

Diffraction of Light Newton pointed out in his 1704 book Opticks that Light is never known to follow crooked passages nor to bend into the shadow This concept is consistent with the particle theory which proposes that light particles must always travel in straight lines. Huygen’s Principle. Any wave (including electromagnetic waves) is able to propagate because the wave . here . affects nearby points . there. In a sense, the wave is the source for more of the wave. Textbook sections 28-4 – 28-6. Physics 1161:. . . Lecture 21. Recall. Interference . (at least 2 coherent waves). Constructive (full wavelength difference). Destructive (½ wavelength difference). Has wave properties.. Can diffract.. Can constructively or destructively interfere. .. Coherent Light. A beam of light that has the same frequency, wavelength, phase, and direction is called . coherent. Physics 2415 Lecture 38. Michael Fowler, . UVa. Today’s Topics. Multi-slit interference. The diffraction grating: spectra. Waves and particles, more diffraction. Radio . astronomy. Light Intensity Pattern from Two Slits. Wave Optics. The wave nature of light is needed to explain various phenomena. Interference. Diffraction. The . particle nature of light was the basis for ray (geometric) . optics. Light waves interfere with each other much like mechanical waves do. Diffraction of light when two fingers brought close together . infront of a light source . Diffraction by razor blade when illuminated by intense blue light . “light is never known to follow . crooked passages nor to . Pg. 459 - 461. Properties of Waves. In order to study the properties of waves, a ripple tank is used. A shallow, glass-bottomed tank on left. ~2cm of water is added. Light from a source above the tank passes through the water and illuminates a screen on the table below. What is . Huygen’s. Principle?. What is . diffraction. ? How does it occur?. What happens to:. the frequency of a wave during diffraction? . The wavelength? . The amplitude?. Through what size opening would you expect to see the most diffraction of a wave?. Up to now we have been studying . geometric optics. . Today we will look at effects related to the . wave nature of light –. . physical optics. polarization. interference. thin film interference. Particles as waves. Aims. understand . that electron diffraction is evidence for wave-like . behaviour. use . the. de . Broglie. . equation. identify situations in which a wave model is appropriate, and in which a particle model is appropriate, for explaining phenomena involving light and electrons. Up to now we have been studying . geometric optics. . Today we will look at effects related to the . wave nature of light –. . physical optics. polarization. interference. thin film interference. Physics . 2212. Light. Light has Wave properties. Light can Diffract. Light can Interfere. Constructively. Destructively. Wave Fronts. Lines that are perpendicular to the motion of the wave, indicate the location of the crests in the waves that are traveling together.. Bellringer – 2 . mins. to hand in. Describe why you think rainbows sometimes pop up after it rains.. DO WORK. STOP. Objectives. Be able to fully explain exactly how rainbows, sunsets, sunrises, polarization, and diffraction work.. Michael Fowler, . UVa. Today’s Topics. Multi-slit interference. The diffraction grating: spectra. Waves and particles, more diffraction. Radio astronomy. Light Intensity Pattern from Two Slits. We have two equal-strength rays, phase shifted by.