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1. A light pipe consists of a central strand of material surrounded by an outer coating....

1. 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 1.60 . If all rays striking the interior walls of the pipe with incident angles greater than 60 degree are subject to total internal reflection, wahat is the index of refraction of the coating?
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Answer #1
Given
The index of refraction of the interior part is , n1 = 1.60
The critical angle is θc = 600
The index of refraction of coating is calculated from Snell' law
n1 sinθc = n2 sin90
n2 = 1.60 *sin60
n2 = 1.38
Thus, the index of refraction of coating is 1.38
    
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