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रविवार, 17 दिसंबर 2017

what is Light ! Full Practical by Eye

Dear Readers
My name is Anuj Kumar
      (optometry 




Light is a from energy whose interaction with retina the sensation of sight. thus, light is the visible portion the electromagnetic radiation spectrum. it lies between ultraviolet and infrared portion from 400 nm at the violet end of spectrum to 700 nm  at the red end the white light consist of seven colours denoted by (VIBGYOR) (violet,indigo ,blue, green, yellow,orange and red).


Nature of Light
To understand the nature of light various theories have been put forward from time to time

No              types rays                                     Wavelength (in nm)
1.                Cosmic rays                                   4x10 power 25
2.                Electronic                                      2.7x 10 power 24
3.                Gamma rays                                   6x10 power 25 to 0.14
4.                 X rays                                            0.14 to 13.6
5.                 Ultraviolet rays                            13.6 to 379
6.                 Visible rays                                   379 to 723
                       a.violet                                      397 to 424                                                            
                       b.indigo                                     424 to 455
                       c.blue                                         455 to 492
                       d.Green                                      492 to 575
                       e.Yellow                                     575 to 585
                       f.Orange                                     585 to 647
                       g.Red                                          647 to 723
7.                 Infrared                                          723 to 1x10 to power 5
8.                 Wireless rays                                 1x10 to power 5 to 3x10 to power 13
                      a.Short                                          1x10 to power 5 to 1x10 to power 10
                      b.long                                           1x10 to power 10 to 3x10 to power 13
9.                  Electromagnetic                            Over 3x10 to power 13
                       ( oscillations)                                                        

At present it has universally accepted that like matter, light also has dual nature; i.e. it possesses the characters of both the wave and the particle. the tow characters of its dual nature are complementary.
                   


 






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