Luminous and Non-Luminous objects
All the objects that we see around us can be categorized into 2 categories
- Luminous : Object which emit light of their own. Eg: Sun, Bulb, Candle, Fire
- Illuminated or Non-luminous : Objects which donot have light of their own, but reflect off the light of luminous objects that fall on them to our eyes . They are visible due to the light they reflect. Moon, Blue Sky, Clouds, Trees, Car, Table
