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WHAT IS THE DIFFERENCE BETWEEN SUNLIGHT AND OTHER ARTIFICIAL SOURCES OF LIGHT LIKE LASER BEAM ,TORCH,ETCIN THEIR CHARACTERISTICS OF COLOURS ,COMPONENT COLOURS,ETC?
Sunlight sustains life in earth,help in photosynthesis of plants.Not all artificial sources can aid photosynthesis.The important point is that light of 
sufficient energy (hv) should be able to excite the photosynthetic pigments necessary for photosynthesis.Laser beam is basically an electromagnetic wave which has the 
same components in the electromagnetic spectrum.
A laser beam has the following important characteristics:
1. Directionality: An ordinary source of light emits light waves in all the directions and is highly divergent. But the divergence or angular spread of a laser is 
very small.
2. Monochromaticity: It means that all the laser rays have same wavelength and frequency when they are emitted from the same source.
3. Brightness: A laser beam has brightness many times in magnitude greater than that of conventional sources due to high directional property of laser beam.
4. Coherence:Two or more light waves are said to be coherent if they bear a constant phase relation among themselves. 
Torch light is same as ordinary light.


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