Question

it is a zone of complete combination
luminous,non luminous​

Answer 1

Answer:

LUMINOUS EMITS ITS OWN LIGHT

NON LUMINOUS DOES NOT EMITS LIGHT ON ITS OWN

Answer 2

Explanation:

Due to complete combustion, the outer zone is blue. This zone is the hottest in temperature when compared to the other zones. This blue coloured zone is the non-luminous part of the flame. The yellow colour region which is the bright part of the flame is the middle zone.