z13-SPEED OF LIGHT

z13-SPEED OF LIGHT - SPEED OF LIGHT IN A FIBER OPTIC CABLE...

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44 SPEED OF LIGHT IN A FIBER OPTIC CABLE Object : To measure the speed of light in a fiber optic cable. Equipment needed : Light pulse transmitter and detector, power supply, 15 cm of plastic fiber, 20 m of plastic fiber, dual-channel oscilloscope (at least 20 MHz bandwidth), two oscilloscope probes. Theory: Internal reflection of a light beam can occur when the index of refraction of the material containing the incident beam is higher than the index of refraction of the surrounding material. When the angle of incidence is greater than arcsine(n o / n i ) total internal reflection occurs and the light can be guided by the optical fiber. To check that the index of refraction of the clear material in the optical fiber has a greater index of refraction than the surrounding medium you can measure the speed of light and calculate the index of refraction. The index of refraction is defined as the ratio of the speed of light in vacuum over the speed of light in the material (n i = c / v i ). Preliminary Setup 1. Turn on the oscilloscope. 2.
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This note was uploaded on 08/25/2011 for the course PHYS 164 taught by Professor Johnjames during the Fall '09 term at MO St. Louis.

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z13-SPEED OF LIGHT - SPEED OF LIGHT IN A FIBER OPTIC CABLE...

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