An Unclad Optical Fiber Has Index of Refraction 1

question 2

Multiple Choice

An unclad optical fiber has index of refraction 1.40. What is the acceptance angle for this fiber if it is submerged in a fluid with index of refraction 1.30? The acceptance angle is the greatest angle at which the light enters the end of the fiber and still causes total internal reflection.

• A) 69.0°
• B) 23.6°
• C) 45.8°
• D) Any angle will be accepted.

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