Here, let us explore various sources of light. A point to remember; Normally, there are two processes which yield light. 1. When the charges vibrate(ions, electrons) light waves[electromagnetic waves] are emitted 2. When high energy electrons return to the low energy state, the excess energy is released as light. But, in this article, we will simply say, when the atoms are agitated, light is given out. 1. Oil lamps and candles: Here, oil and wax burn using atmospheric oxygen. It is a combustion process. Heat generated in the process agitates the vapour atoms around the wick. Hence light is emitted. 2. Incandescent lamps: The tungsten bulb is the first electric lamp. Electric current is sent through the tungsten filament; Heated to very high temperature; tungsten atoms...