Question

what is the main material used in the core of a fiber optic cable? copper plastic or glass aluminum steel

Explanation:

Fiber - optic cables transmit light. Glass (silica - based) or plastic (like PMMA - poly(methyl methacrylate)) can be used as they are good at guiding light through total internal reflection. Copper is used in electrical wires (for conducting electricity), aluminum is also an electrical conductor and used in some power lines, and steel is a metal used for its strength (e.g., in construction, as a reinforcing material in some cables for mechanical strength but not for the core of fiber - optic cables which is for light transmission).

Answer:

Plastic or Glass