Answer:
Correct Answer is Glass and Plastic
Explanation:
Optical fibers are glass or plastic tubes as thin as human hair.Optical fibers are used for communication purposes. The working of optical fiber are based on the phenomena of total internal reflection.
There are three main region of an optical fiber which are made of plastic or glass with different refractive indices these are as follows.
1. core
2. Cladding
3. Sheath
