What is the critical angle for light traveling in a polystyrene (a type of plastic) pipe surrounded
Question:
What is the critical angle for light traveling in a polystyrene (a type of plastic) pipe surrounded by air?
Strategy
The index of refraction for polystyrene is found to be 1.49 in Figure 25.14, and the index of refraction of air can be taken to be 1.00, as before. Thus, the condition that the second medium (air) has an index of refraction less than the first (plastic) is satisfied, and the equation θc = sin-1 (n21) can be used to find the critical angle θc. Here, then, n2 = 1.00 and n1 = 1.49.
Data from Figure 25.14
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