https://www.khanacademy.org/.../v/thin-film-interference-part-1 You will see bands of different colors on the surface of a puddle. C. Neither of the above equations. PHY 2049: Chapter 36 14 Reflection and Interference from Thin Films ÎNormal-incidence light strikes surface covered by a thin film Some rays reflect from film surface Some rays reflect from substrate surface (distance d further) ÎPath length difference = 2d causes interference From full constructive to full destructive, depending on λ d n 1 n 2 n 0 = 1 Thin Film Interference ; The most common example of interference is interference in thin films. If the thickness of the film is on the order of the wavelength of light, then colorful patterns can be obtained, as shown in the image on the right. The light reflected from any one Thin Film Interference: The patterns of colors that one sees in oil slicks on water or in bubbles is produced by interference of the light bouncing off the two sides of the film. Interference of Light. �� � w !1AQaq"2�B���� #3R�br� LO9 - Thin Film Interference 1. Example: Thin film of air: Glass Air Glass L For a given (vacuum) wavelength of normally incident light, which equation gives the film thicknesses for constructive interference of reflected light? • Film Thickness Measurement by Interference • Stokes Relations • Multiple-Beam Interference in a Parallel Plate Last Lecture • Superposition of waves • Laser Chapter 7. Determine the phase difference due to reflection between the portion of the wave reflected at the upper surface and the portion reflected at the lower surface. https://www.khanacademy.org/.../v/thin-film-interference-part-1 Slideshare uses cookies to improve functionality and performance, and to provide you with relevant advertising. $4�%�&'()*56789:CDEFGHIJSTUVWXYZcdefghijstuvwxyz�������������������������������������������������������������������������� ? B. LO9 - Thin Film Interference 1. Thin Film Interference 12 n1 n2 n3 n1 �� y ���� ���� t u v w x ���������������������������������������������������������������������������������������������������������������������������������������������������������������������������������������������������������������������������������������������������������������������������������������������������������������������������������������������������������������������������������������������������������������������������������F�� �*B�.�y)]�ܙg����� JFIF �� ;CREATOR: gd-jpeg v1.0 (using IJG JPEG v62), quality = 70 Thin-Film Interference . You can change your ad preferences anytime. �� � } !1AQa"q2���#B��R��$3br� m A. – A free PowerPoint PPT presentation (displayed as a Flash slide show) on PowerShow.com - id: 7a69aa-YTMxN "0A149;>>>%.DIC;�� C If you continue browsing the site, you agree to the use of cookies on this website. Now customize the name of a clipboard to store your clips. To understand this we need to discuss the phase changes that occur when a wave moves from one medium to the another where the speed is different. We use your LinkedIn profile and activity data to personalize ads and to show you more relevant ads. A substance that is normally clear and colorless can appear to give off an array of colors when it is found in a very thin layer 3. Thin-film interference is also what happens on the surface of a CD or DVD, where the protective lacquer coating acts as the thin film. The Interference. Scribd will begin operating the SlideShare business on December 1, 2020 Get the plugin now. One example of this is an oil slick. Light - Light - Thin-film interference: Observable interference effects are not limited to the double-slit geometry used by Thomas Young. Consider the case of a thin film of oil of thickness t floating on water. When light hits a material that has multiple layers, each layer can reflect light. There isn't a thin film of soap or lacquer on the surface of a bird or a butterfly, so what's going on there? You find this a lot of times on a road after a rain storm. So, what are the rules for how waves reflect from surfaces - what happens to the phase? A substance that is normally clear and colorless can appear to give off an array of colors when it is found in a very thin layer 3. If you continue browsing the site, you agree to the use of cookies on this website. The Adobe Flash plugin is needed to view this content. The phenomenon of thin-film interference results whenever light reflects off two surfaces separated by a distance comparable to its wavelength. A thin film is a thin layer of material that has a different index of refraction than its surroundings. %&'()*456789:CDEFGHIJSTUVWXYZcdefghijstuvwxyz��������������������������������������������������������������������������� �{��nX0�s2��)����櫳�4n�D�l�M"�,0iY�B3�*�1R*l3�^ ;��j���Y*Y �W�ZGm��D�r ��?I��?0�\{U�. 2 L (m 1 2) , m 1 , 2 , . Learn more. View by Category Toggle navigation. Slideshare uses cookies to improve functionality and performance, and to provide you with relevant advertising. See our User Agreement and Privacy Policy. Examples of Thin-Film Interference Soap bubble Thin oil film. �� C Thin Film Interference When light hits a surface, it can be absorbed, transmitted or reflected. Thin Film Interference What is a thin film? PPT – Thin Film Interference: PowerPoint presentation | free to view - id: 1098a4-OWI0Z. If you wish to opt out, please close your SlideShare account. The “film” between the surfaces can be a vacuum, air, or any transparent liquid or solid.

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