Light : Light is a form of energy. It is composed of waves of electric and magnetic vibrations which our eyes can detect. The different colours are produced by light waves of different lengths. We are unable to see waves shorter than blue light and longer than red.
fluorescent light bulbs
How does a fluorescent tube work ?
A hot wire inside the tube sends out particles called electrons, which crash into atoms of mercury gas. The mercury atoms give out invisible ultraviolet radiation. The white phosphor coating inside the tube changes this into Bright Visible Light
Laser Pictures , Laser emission reflection
How does a laser work ?
Light is normally composed of different wavelength mixed at random. A laser produces an intense beam of high-energy light in which all the light is of the same wavelength. The process is started by an electric current or a flash of light from a flash tube which causes a gas or ruby rod to send out the laser beam.
Laser picture - Imae Credit : ucdavis.edu
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