A light ray in the core (n = 1.40) of a cylindrical optical
fiber is incident on the cladding. A ray is transmitted through the
cladding (n = 1.20) and into the air. The emerging ray makes an
angle θ2 = 6.30° with the outside surface of the cladding. What
angle θ1 did the ray in the core make with the axis?
3
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