An optical fiber having index of refraction 1.40 is clad with a material of index of refraction 1.25. What is the critical angle in the fiber at the fiber-cladding interface?
A) $41.8^{\circ}$
B) $63.2^{\circ}$
C) $26.8^{\circ}$
D) $16.5^{\circ}$
E) $73.0^{\circ}$

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The Answer of An optical fiber having index of refraction 1.40 is clad with a material of index of refraction 1.25. What is the critical angle in the fiber at the fiber-cladding interface?
A) $41.8^{\circ}$
B) $63.2^{\circ}$
C) $26.8^{\circ}$
D) $16.5^{\circ}$
E) $73.0^{\circ}$

An Optical Fiber Having Index of Refraction 1 41.8∘41.8^{\circ}41.8∘ B) 63.2∘63.2^{\circ}63.2∘ C) 26.8∘26.8^{\circ}26.8∘

An Optical Fiber Having Index of Refraction 1 $41.8^{\circ}$ B) $63.2^{\circ}$ C) $26.8^{\circ}$