Lab 5P - Physics Lab Lab 6 Interferometer Aleksey Zelenberg...

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Physics Lab Lab 6 – Interferometer Aleksey Zelenberg
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Introduction This experiment had four parts two it. In the first two parts, we measured the wavelength of a laser beam through air. In the Fabry-Perot mode, we obtained a wavelength of 640nm ± 16 nm and in the Michelson mode, we obtained a wavelength of 730nm ± 3nm. In the third part of the experiment we measured the index of refraction of air and obtained a value of n air = 1.000131425 ± 8*10 -8 . In the fourth part of the experiment we measured the index of refraction of glass and obtained a value of n glass = 1.6 ± 0.1. Procedure i In the Fabry-Perot mode we began by adjusting the micrometer knob to approximately 500μm such that a “bull’s-eye” interference pattern was clearly visible. We then turned the knob until the initial interference pattern re-emerged for the twentieth time and recorded the final micrometer reading. We repeated this ten times to ensure statistically accurate results. The
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procedure in the Michelson mode is nearly identical to the one mentioned above except that the initial position of the micrometer knob was set to approximately 50μm. Once we obtained the ten distances moved by the micrometer, we calculated ten corresponding wavelengths using the equation: , where d
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Lab 5P - Physics Lab Lab 6 Interferometer Aleksey Zelenberg...

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