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 $\degree$

Question

Quizplus · Accepted Answer

Using Snell's Law, we can calculate the critical angle for total internal reflection:

sin(critical angle) = n_water / n_fiber = 1.33 / 1.50
sin(critical angle) = 0.8867
critical angle = sin^(-1)(0.8867)
critical angle ≈ 62.5°

Therefore, the correct choice is B.

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

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