Question

Make a list of some luminous objects and substances and classify them into natural and artificial sources of light.

Answer 1

The objects which emit light of their own are called luminous objects. In order to emit light, the object must have its own source of energy.


a. Candle burns and emits light on its own, so is a luminous object. It is man- made.


b. The sun can emit light of it’s own, so is a luminous object. It is natural.


c.An electric bulb is also a luminous, man-made object.

Answer 2

natural artificial

1. sun 1. electrical bulb

2 star 2. torch

3. electrical tube