Question

explain why metallic bodies are Opaque and transparent bodies are insulator​

Answer 1

b) Semiconductors are opaque to visible light, but opaque to infrared light. (c) Insulator are transparent to visible light. Visible light will be absorbed and scattered by all of the free electrons in a metal. ... That means it will pass through without getting absorbed.

Answer 2

Transparent bodies are insulator because they don't contains free electrons and metallic bodies are opaque because of its dull surface .