A Fiber Optic Cable (N = 1 $\degree$ B)625 $\degree$ C)418 $\degree$ D)276 $\degree$

Multiple Choice

A fiber optic cable (n = 1.50) is submerged in water (n = 1.33) .What is the critical angle for light to stay inside the cable?

A) 83.1 $\degree$
B) 62.5 $\degree$
C) 41.8 $\degree$
D) 27.6 $\degree$