Question

(a) What is meant by a luminous object? Name two luminous objects.

(b) What is meant by a non-luminous object? Name two non-luminous objects.

Answer 1

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

(b) A non-luminous object is one that does not produce its own light, although it can still reflect light from other sources. 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). Planets are also non-luminous objects.