What is the index of refraction of the coating

Reference no: EM13549679

A light pipe consists of a central strand of material surrounded by an outer coating. The interior portion of the pipe has an index of refraction of 1.74. If all rays striking the interior walls of the pipe with incident angles greater than 66.6 degrees are subject to total internal reflection, what is the index of refraction of the coating?

Reference no: EM13549679

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