What are the reasons for Surat An-Nur being named with this name?

Surat An-Nur is given this name because the word "light" (An-Nur) is mentioned in it, as in the Almighty's saying: "Allah is the Light of the heavens and the earth. The example of His light is like a niche within which is a lamp, the lamp is encased in glass, the glass as if it were a brilliant star, lit from [the oil of] a blessed olive tree, neither of the east nor of the west, whose oil would almost illuminate even if no fire touched it. Light upon light. Allah guides to His light whom He wills. And Allah presents examples for the people, and Allah is Knowing of all things."