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    				| 1. | Question 9 Figure shows a cross section of a 'light pipe made of a glass fibre of refractive index V2. The outer covering of the pipe is made of a material of refractiv index 1.5 What is maximum angle of the incident ray with the axis of the pipe for which total internal reflections inside the pipe take place:- 23/2 Cladding Core V2 | 
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