A Fiber Optic Is Made by Cladding a Thin Fiber

question 126

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 maximum incident angle, Ɵ, so that the light ray is totally internally reflected inside the fiber?

• A) 24.1º
• B) 26.4º
• C) 28.2º
• D) 30.3º
• E) 32.7º

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