Question

which materials can be used to make fiber optic strands? metal and glass glass and plastic plastic and metal glass and ceramic

Explanation:

Fiber - optic strands are used for transmitting light signals. Glass (silica - based glass is common) has excellent optical properties for guiding light due to its high purity and ability to be drawn into thin fibers. Plastic (such as polymethyl methacrylate - PMMA) can also be used as it is more flexible and less brittle in some cases compared to glass, although it may have lower performance in terms of signal loss over long distances compared to high - quality glass fibers. Metals are good conductors of electricity but not light (they are opaque to visible and near - infrared light which is used in fiber - optics), and ceramics (in general) are not typically used for the core of fiber - optic strands as they do not have the required optical transparency and flexibility for light - guiding in the same way as glass and plastic.

Answer:

glass and plastic