Question

What are primary and secondary sources of light?

Answer 1

1. Primary sources of light: 
   Primary sources are those that produce their own light. The emission of light from these sources can occur in several ways:
   • The high temperature of the source, like the Sun, stars, flames, or other hot objects, contributes to its emission.
   • The light can also be produced by the flow of current through devices like a TV or tubelight.
   • Firecrackers, nuclear energy producers, and other chemical or nuclear reactions are examples of sources of light.
2. Secondary sources of light:
   • Secondary sources are those that absorb light from another source and either reflect or disperse it rather than producing light of their own.
   • For instance, reflected light allows us to see the moon, planets, and other objects like people, animals, plants, etc. 
   • Secondary sources make up the majority of the sources we encounter, and the majority of them are extended sources.