# #7 - Dispersion Light and Color for Nonscientists PHYS 1230...

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Unformatted text preview: Dispersion Light and Color for Nonscientists PHYS 1230 Geometrical optics - how does light change direction? Reflections (mirrors, seeing your image) Refractions (bending light, light in water) Dispersion (rainbows, prisms) speed = c = distance time = λ T = λ f Each color has a different wavelength and frequency, but the SAME SPEED in air http://science.hq.nasa.gov/kids/imagers/ems/index.html Light slows down in materials compared with air • Speed in medium = speed in vacuum n • n = speed of light in vacuum speed of light in substance Concept Question • Speed in medium = speed in vacuum n • n = speed of light in vacuum speed of light in substance What is the refractive index of diamond? A. 1 B. 0 C. 1.5 D. 2.4 Concept Question Consider light propagating in glass where the index is 1.5 What is the speed of light in glass? A) 3 x 10 8 m/sec B) 1.5 m/sec C) 2 x 10 8 m/sec Light slows down in denser materials http://acept.la.asu.edu/PiN/rdg/refraction/refraction.shtml • Light waves incident on glass change direction and wavelength when transmitted into the glass because the part of the wave in the medium begins to slow down, causing the light beam to bend. • This is like when a marching band needs to make a turn Concept Question Which ray is drawn correctly? A, B or C? normal to surface glass or water incident ray A B C normal to surface glass or water refracted rays incident ray reflected rays Concept Question Which ray is drawn correctly? A, B or C? A B C http://acept.la.asu.edu/PiN/rdg/refraction/refraction2.shtml Concept Question What is the angle of total internal reflection? A) 41 degrees B) 90 degrees C) 49 degrees OPTICS IN THE MOVIES PUZZLER http://www.hands-on-optics.org/puzzler/ Computer animation has become increasingly popular in recent years. There are still some optical effects that are difficult to replicate in computer animation. See if you can notice what is incorrect in this image from the movie, Shrek 2? APPLETS ON REFRACTION AND DISPERSION http://micro.magnet.fsu.edu/primer/java/scien ceopticsu/refraction/refractionangles/index.ht ml NOTE: Select white light http://micro.magnet.fsu.edu/primer/java/scien ceopticsu/prism/index.html http://micro.magnet.fsu.edu/primer/java/prism/index.html Concept Question - Which Colors bend more?Concept Question - Which Colors bend more?...
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## This note was uploaded on 02/26/2008 for the course PHYS 1010 taught by Professor Murnane,ma during the Spring '08 term at Colorado.

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#7 - Dispersion Light and Color for Nonscientists PHYS 1230...

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