The part of the fiber optic cable that confines light within the cable is called ____.

The component of a fiber optic cable responsible for confining light within the cable is the core. The core is the central part of the fiber, typically made from glass or plastic, through which the light is transmitted. This core has a higher refractive index than the surrounding cladding, allowing light to be internally reflected as it travels through the fiber.

While the cladding does play a critical role in the overall performance of the fiber optic cable by preventing light from escaping and providing additional protection, it is not the part that directly carries and confines the light. Instead, it acts as a barrier that keeps the light within the core and contributes to the total internal reflection that is essential for effective signal transmission.

The buffer and sheathing are protective layers that ensure durability and robustness of the cable but do not contribute to the optical properties that confine light. Thus, the core is recognized as the essential component for light transmission in fiber optic cables.