A Light Ray (Red)enters a Concentrically Cladded Optical Fiber at Its

question 15

Multiple Choice

A light ray (red) enters a concentrically cladded optical fiber at its center and an angle of 29.0° to the axis of the fiber.The diameter of the fiber is 1.0 mm and its refractive index is nf = 1.35.What must be the value of ncladding to guarantee total internal reflection? (n_air = 1.00)

• A)1.18
• B)1.26
• C)1.70
• D)1.08

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