Practice Problems (1) What happens to the light which approaches the fiber outside of the cone of acceptance? The angle of incidence is 30° as shown in the figure (calculate the angle of refraction at the air/core interface, Or/ critical angle, Oc/ incident angle at the core/cladding interface, Oi/) does the TIR will occur? Cone of acceptance Na1.0 No= 1.5 30 Incoming ray
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