An Optical Fiber Is Made of Clear Plastic with Index

question 39

Multiple Choice

An optical fiber is made of clear plastic with index of refraction n = 1.57.For what angles with the surface will light remain within the plastic "guide"?

• A)ϕ < 32.5°
• B)ϕ < 57.3°
• C)ϕ < 39.6°
• D)ϕ < 50.4°
• E)ϕ < 68.7°

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