A Fiber Optic Is Made by Cladding a Thin Fiber

question 69

Multiple Choice

A fiber optic is made by cladding a thin fiber core of refractive index n₁ = 1.45 with a material of refractive index n₂ = 1.38. What is the critical angle, Ɵ_c, at the core-cladding interface?

• A) 44º
• B) 46º
• C) 55º
• D) 72º
• E) None of these is correct.