FRANKLYWNOW - 640 x 360

640 x 360

Published: Jan 24, 2018 2:08 PM Updated:
Silver Spring, Maryland -

In the fifth century BC, Empedocles postulated that everything was composed of four elements; fire, air, earth and water. He believed that Aphrodite made the human eye out of the four elements and that she lit the fire in the eye which shone out from the eye making sight possible. If this were true, then one could see during the night just as well as during the day, so Empedocles postulated an interaction between rays from the eyes and rays from a source such as the sun.[28]

In about 300 BC, Euclid wrote Optica, in which he studied the properties of light. Euclid postulated that light travelled in straight lines and he described the laws of reflection and studied them mathematically. He questioned that sight is the result of a beam from the eye, for he asks how one sees the stars immediately, if one closes one's eyes, then opens them at night. If the beam from the eye travels infinitely fast this is not a problem.[29]

In 55 BC, Lucretius, a Roman who carried on the ideas of earlier Greek atomists, wrote that "The light & heat of the sun; these are composed of minute atoms which, when they are shoved off, lose no time in shooting right across the interspace of air in the direction imparted by the shove." (from On the nature of the Universe). Despite being similar to later particle theories, Lucretius's views were not generally accepted. Ptolemy (c. 2nd century) wrote about the refraction of light in his book Optics

  • Automation Test*Breaking NewsMore>>

  • nk

    nk

    Wednesday, February 12 2020 6:45 AM EST2020-02-12 11:45:23 GMT
    Wednesday, February 12 2020 6:47 AM EST2020-02-12 11:47:29 GMT
  • nk test 3

    nk test 3

  • nk test

    nk test

Powered by Frankly
All content &copy; Copyright 2000 - 2020. All Rights Reserved. <BR>For more information on this site, please read our <a href="//wnow.worldnow.com/story/18990/this-web-sites-privacy-policy" >Privacy Policies </a>, and <A HREF="//wnow.worldnow.com/story/18991/this-sites-terms-of-service">Terms of Service</A>.