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AP Physics 2
13.3 Refraction
IntermediateMCQConceptual20.5k
A horizontal optical fiber shown in cross-section, consisting of an inner cylindrical core with refractive index labeled n_core, surrounded above and below by a cladding layer with refractive index labeled n_cladding. A light ray inside the core travels toward the upper core-cladding boundary, striking it at an angle theta relative to a dashed line normal to the interface. No other labels, lines, text, or axes appear.
Light ray approaching the core-cladding interface in an optical fiber.
An engineer is selecting materials for an optical fiber consisting of a cylindrical core enclosed by an outer cladding layer. Light signals travel long distances through the core by undergoing total internal reflection at the core-cladding interface. Which of the following correctly pairs the required relationship between the refractive indices of the core and cladding with the condition for the angle of incidence \(\theta\) relative to the critical angle \(\theta_c\)?

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