# Lab 4 - Shannon MacAdams Eric Kirchoff TA Miaoyin(Kevin...

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TA: Miaoyin (Kevin) Wang Physics 232—Section 232-006 Lab performed Feb. 10, 2009 Lab due Feb. 17, 2009 Lab Four: Speed of Light Introduction: The purpose of this lab is to continue the study of light refraction by measuring the speed of light in an optic fiber. This lab continues the use of Snell's law, utilizes the index of refraction of different materials and how they interact, and shows how the layers of the optical fiber use each other to be able to take measure of the speed of light in a plastic fiber optic waveguide. As learned in the previous lab, Refraction of Light, the speed of light in a vacuum is approximated by 3x10^8 m/sec and is calculated by v = Δx/Δt where v is the speed of light and t is the time a pulse of light takes to travel a distance x. The speed of light in a vacuum differs from the speed of light in a material; the speed of light depends on the type of material and is less than that of a vacuum. Also covered in the previous lab, the index of refraction for the material, n, is the ratio of the speed of light in a vacuum, c, to that in a material, v: n = c/v. The optical fiber used in this lab has an index of refraction of ~n = 1.5; this optical fiber is made of layers including the jacket, strength members, buffer, cladding, and core (respectively, from outer to inner). The central core, the portion that transmits the light, is encased by the cladding, the portion that has a different index of refraction from the central core. The highest quality optical fibers transmit light over long distances with very little loss of intensity or distortion of the waveform and are made of

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## This note was uploaded on 04/07/2009 for the course PHYSICS 232 taught by Professor Mannella during the Spring '08 term at University of Tennessee.

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Lab 4 - Shannon MacAdams Eric Kirchoff TA Miaoyin(Kevin...

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