In the basic physics study of 'Light', every single physical object in the universe is divided into two distinct categories based on whether it can produce its own light. These are Luminous and Non-Luminous objects.
A firefly (glow-worm) is a highly rare example of a biological luminous object. It creates cold light inside its body through a massive chemical reaction called Bioluminescence.
No. A mirror only reflects light. If you put a mirror in a totally dark room without any bulbs, it will be completely dark. Therefore, it is strictly non-luminous.
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