A Fiber Optic Is Made by Cladding a Thin Fiber

question 128

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. The numerical aperture of a fiber optic is defined as NA = n_air sin θ_m, where θ_m is the maximum incident angle so that the light ray is totally internally reflected inside the fiber. The NA for the fiber is

• A) 0.445.
• B) 0.614.
• C) 0.645.
• D) 0.407.
• E) 0.470.

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