Topic: Optical Instrumentation
A typical optical fiber has
- A. high refractive index core and low refractive index cladding
- B. Low refractive index core and high refractive index cladding
- C. Uniform refractive index core surrounded by variable refractive index cladding
- D. None of the above
Answer: A. high refractive index core and low refractive index cladding
Explanation: For total internal reflection to occur within the optical fiber, the refractive index of the core ($n_1$) must be greater than the refractive index of the cladding ($n_2$).