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A light pipe is made of glass fibre of refractive index 1.57 the outer covering of the pipe is made of a material of refractive index 1.36 the range of angles of incident rays with the axis of the pipe for which total internal reflection inside the pipe take place is nearly1. 0 degree < i < 38 degree 2. 0 degree < i < 90 degree 3. 0 degree < i < 60 degree 4. 0 degree < i < 53 degree |
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Answer» A light pipe is made of glass fibre of refractive index 1.57 the outer covering of the pipe is made of a material of refractive index 1.36 the range of angles of incident rays with the axis of the pipe for which total internal reflection inside the pipe take place is nearly 1. 0 degree < i < 38 degree 2. 0 degree < i < 90 degree 3. 0 degree < i < 60 degree 4. 0 degree < i < 53 degree |
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