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a.Figure shows a cross-section of a 'lig...

a.Figure shows a cross-section of a 'light pipe' made of glass fibre of refractive index 1.68
The outer converting of the pipe is made of a material of refractive index 1.44. What is the range of the angles of the incident rays with the axis of the pipe for which total reflections insides the pipe take place as shown in the figure.
b.What is the answer if there is no outer converting of the pipe ?

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Verified by Experts

The correct Answer is:
60
b. `90^(@)`
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