4.1. A silica multimode step index fiber has a core refractive index of 1.46. Determinethe optical loss in decibels due to Fresnel reflection at a fiber joint with:(a) a small air gap;:(b) an index-matching epoxy which has a refractive index of 1.40.It may be assumed that the fiber axes and end faces are perfectly aligned at the joint.Ans. (a) 0.31 dB; (b) 3.8 x 10-4 dB4.2. The Fresnel reflection at a butt joint with an air gap in a multimode step indexfiber is 0.46 dB. Determine the refractive index of the fiber core.Ans. 1.59

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