A fiber optic wire uses total internal reflection to transmit light down the wir

Question

A fiber optic wire uses total internal reflection to transmit light down the wire. It is constructed from two type of with indices of refraction n = 1.45 and n_2 = 1.52. A glass filament forms the cone of the wire with a cladding of the other glass type wrapped around it. Which glass forms the core and which forms the cladding? Briefly justify your answer. What is the minimum incident angle a light ray originating from within the core can strike the core/cladding boundary and not be transmitted through it at all? You are standing on the bottom of a pool looking up. You consider the fact that you can only see object if light rays from that object reach your eyes. Based on the properties of reflection and refraction describe which of the following objects you could see. and where they would appear to be to your (see figure at right): the sun the person on the springboard the fish in the water with you. Parallel light rays, in air move towards a glass shape of unknown geometry. Choose the appropriate glass shape below that would given you exiting parallel light rays that are slighty bent upwards compared to the entering light rays.

Explanation / Answer

2) sun and man at less height than real distance.and fish at actual  distance.

3) in 1, 3, 5 entering and exiting rays are parallel

in 2, 4 exiting rays are not parallel if entering are parallel.

(6) provides the required conditions

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