What is the index of refraction of the coating

Reference no: EM13677287

A fibre optic cable or "light pipe" consists of a central strand of material surrounded with an outer coating. The interior portion of the pipe has an index of refraction of 1.55. If all rays stricking the interior walls of the pipe by incident angles greater than 56.4 degrees are subject to total internal reflection, what is the index of refraction of the coating?

Reference no: EM13677287

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