A fiber optic cable (n = 1.53)is submerged in water (n = 1.33).What is the critical angle for light to stay inside the cable?

Question

Quizplus · Accepted Answer

The critical angle can be found using Snell's Law, which is sin(θc) = n2/n1, where n2 is the refractive index of the second medium (water, n = 1.33) and n1 is the refractive index of the first medium (fiber optic cable, n = 1.53). Solving for θc gives a critical angle of approximately 60.4°.

A Fiber Optic Cable (N = 1