Question

What is meant by (a) luminous objects, and (b) non-luminous objects? Name two luminous objects and two non-luminous objects. State whether the moon is a luminous object or a non-luminous object.

Answer 1

Luminous objects:

1. Luminous objects are those which emit light on their own. They won't take the help of other objects to emit the light.
2. Example:- stars, burning candles etc.

Non-luminous objects:

1. A non-luminous object is one that does not produce its own light, although it can still reflect light from other sources.
2. The Moon is an example of a non-luminous object; we can only see the Moon because it reflects light from the Sun (which is a luminous object).
3. Planets are also non-luminous objects.