Question

what three parts of a fiber-optic cable are meant to protect the parts that carry the light?
cladding
cable jacket
coating
strengthening fibers
question: 3/10

Explanation:

To determine the three parts of a fiber - optic cable that protect the light - carrying parts (the core), we analyze each option:

1. Coating: It is a thin layer around the core - cladding structure. Its main function is to protect the delicate optical fibers from physical damage, such as scratches, and also to provide some insulation.
2. Strengthening fibers: These are usually made of a strong material like Kevlar. They are designed to protect the optical fibers from tensile stress. When the cable is pulled or bent, the strengthening fibers bear the mechanical load, thus safeguarding the light - carrying core and cladding.
3. Cable jacket: This is the outermost layer of the fiber - optic cable. It provides overall protection to the internal components (including the light - carrying parts) from environmental factors like moisture, abrasion, and physical impacts from the outside world.

Cladding, on the other hand, is not a protective layer for the light - carrying part in the sense of the question. The cladding has a lower refractive index than the core and is mainly responsible for total internal reflection, which is related to the propagation of light in the core, not protection.

Answer:

The three parts are coating, strengthening fibers, and cable jacket.