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HISTORY OF SPEED OF LIGHT

 Speed of the light

Hello people, today our topic is the history of the speed of light from Aristotle to Albert Einstien lot of people derive the speed of  light with some interesting experiments let us see them one by one in short 

List of the people who found the speed

  • Aristotle
  • Ibn al-Haytham
  • Galileo
  • Sir Isaac newton
  • Romer
  • Fizeau
  • Foucault
  • Albert.A.Michelson

Aristotle

The first reference of motion of light is found by him he is a greek philosopher he said it is 300BC. He says that light does not take time to travel from one place to another place.  But now we prove it is a wrong statement 

Ibn al-Haytham

He is the first man who does a systematic experiment to find the speed of light he lived in Egypt he is the father of modern optics. He uses Camera Obscura a pinhole camera that passes different light rays that travel outside of a camera to reach a specific point on the screen. His logic is to be taking finite time to travel a finite distance. The value is just above the speed of the sound.

Galileo 

He found it by using the distance between the hilltop and his pulse as a time. His assistance does it the different distances they get the same value. His calculated value of the light is ten times the speed of the light.

Isaac Newton 

He estimated the speed of the light is 112000000m/s

Romer 

He is a Danish Physicist who made an elaborate experiment to find the speed of light he use a telescope to point the moon IO of Jupiter at the time of eclipse to find speed the of light. It is part of the cosmic horizon curriculum collection he found it in 1676 his value is 227000000m/s

Fizeau

He improved galileos experiment. He did it with an intense source of light from a rotating mirror about eight-kilometers distance. the light source is interrupted by the rotating cogwheel or chopper it has 720 notches it rotates at different speeds up to 100 times per second. His value is 313000000m/s.
credit:https://commons.wikimedia.org/wiki/Commons:GNU_Free_Documentation_License,_version_1.2

Foucault

He determines the speed of the light by modifying the fizeaus experiment. He reflected the beam of the light from a rotating mirror to a fixed mirror and back creating two separate reflected beams with an angular displacement that is related to the time that was required for the light to travel
a given distance to be fixed. His value is 298000000m/s.
https://commons.wikimedia.org/wiki/Commons:GNU_Free_Documentation_License,_version_1.2

Albert.A.Michleson

He found it through by highly precision morden electronic circuit. He uses an 8-sided mirror device 
https://commons.wikimedia.org/wiki/File:Speed_of_light_measurement_device,_Albert_A._Michelson_-_Museum_of_Science_and_Industry_%28Chicago%29_-_DSC06435.JPG


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