laser and its use
 

laser means light amplification and stimulate emission of radiation .
in this way coherent beam of light and focused energy is transmitted at a single point .
monochromatic
white light consist of seven differnt frequencies but in laseer only single light of frequency radiation spread out .
coherent
in normal light moves in crest and trough form , but not in the same phase but laser has the capability to move crest and trough in the same phase .
parallel wave front
in the laser light , the light follows parallel wave front . that is hy covrers such a long distance
uses
in laser surgery of hir transplant .
in the cancr tumors
in diamond to drill holes .

Radiation is must

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optical fibers
 

optical fiber have made the communication rapid annd fast . it is made up of plastic or glass wher light travels in long distance by phenomenon of total internal reflection .
in the transmission line fibers are spread from the one place . the bundle of fibers covers the all respective prts with out any void , this way teh light behaves in one fiber as a reflected . the other part of fiber .in the same frequency of light .thewallact as a boundry to reflect the light from the original pth , in next fiber refraction of ligh means straight movement , cause the light travel some distance .then walls reflect the light . this way light or any wavestravesls a longdistance .
in the trasmission of the tv the light energy is converted in to sound energy trogh accounstic or booster at receiving end .
same the amplifier are use ful to do the respective function .
uses
revolution in telecommunication.telphone
live tv

Major and important differences:
1) Angiosperms and Gymnosperms
2) pig iron and wrought iron
3) haze and smog
4) erosion and weathering
5) cerebral nerves and spinal nerves
6) replication and transcription
Important note:
acid rain,salinity, international date lines,