Copy of David Werner - HW 19-1 Interference of Lig

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Physics 2 - Mr. Squires HW 19-1 Interference of Light Read: Physics Textbook pages 522 to 530 Watch: Veritasium: The Original Double Slit Experiment: https://youtu.be/Iuv6hY6zsd0 Veritasium: The Brightest Part of a Shadow is in the Middle https://youtu.be/y9c8oZ49pFc Bryan Rolfe: Thin film interference and the beauty of soap bubbles https://youtu.be/WTxDyYHaYAI 1. Define: a. Incoherent Light: does not contain photons with the same frequency and does not have wavelengths that are in phase with one another. This type of light is diffuse, like that of a flashlight, rather than a steady stream of light as with a laser. b. Coherent Light: is a beam of photons (almost like particles of light waves) that have the same frequency and are all at the same frequency. Only a beam of laser light will not spread and diffuse. In lasers, waves are identical and in phase, which produces a beam of coherent light . c. Interference Fringes: a bright or dark band caused by beams of light that are in phase or out of phase with one another. d. Monochromatic Light: electromagnetic radiation derived from photon emissions from atoms. Photons propagate, or travel, as energy wave fronts of different lengths and levels of energy. Energy levels determine the frequency of light , and the length of a wave determines its color. e. Thin Film Interference: Thin-film interference is a natural phenomenon in which light waves reflected by the upper and lower boundaries of a thin film interfere with one another, either enhancing or reducing the reflected light. 2. Two very narrow slits are cut close to each other in a large piece of cardboard. They are illuminated by monochromatic red light. A sheet of white paper is placed far from the slits and a pattern of dark and light bands is seen on the paper: a. Explain why some regions are bright and some regions are dark Interference fringes
Physics 2 - Mr. Squires HW 19-1 Interference of Light b. What would happen to the distance between the bands if the white paper were moved closed to the cardboard? They would be further away c. What would happen to the distance between the bands if the monochromatic red light were replaced by monochromatic blue light? Become closer d. Why is it important that monochromatic light was used to make the interference pattern in the double-slit investigation? Because light travels in differenet wavelengths 3. Explain why the position of the central bright band of a double-slit interference pattern cannot be used to determine the wavelength of the light. Because it will be the same everytime, its the center 4. What is the “Poisson Spot”? bright point that appears at the center of a circular object's shadow due to Fresnel diffraction. 5. What factors influence constructive or destructive interference in thin-film interference? Thin film interference thus depends on film thickness, the wavelength of light, and the refractive indices. For white light incident on a film that varies in thickness, you will observe rainbow colors of constructive interference for various wavelengths as the thickness varies. 6. When a wave strikes a boundary, the wave may be partially reflected and partially transmitted. What happens to the phase of the reflected wave if the transmitted wave: a. Speeds up Shifts to blue b. Slows down Shifts to red 7. Determine the number of phase inversions of the reflected light waves when light is traveling in through the following three media: a. Air – Water (n = 1.33) – Air 5 b. Air – Oil (n = 1.45) – Water 3 c. Glass (n=1.52) – Oil – Air 7
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