Question

The glass containing litharge as an ingredient makes the optical fibers glow because of it:

• A. increases the refractive index.
• B. has low density.
• C. is highly thermally resistant.
• D. scatters all the radiations incident on it.

Answer 1

The correct option is A increases the refractive index.

Litharge having a tetragonal crystal structure, and It is made up of $PbO$ so optical fibers made from this will glow due to increase in refractive index .