Use the Following Figure Below for the Next Problem $\theta$ _m,where $\theta$

question 10

Multiple Choice

Use the following figure below for the next problem.
The figure shows a cross-
-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 $\theta$ _m,where $\theta$ _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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