Jafar Sadik is said to have propounded few other important scientific theories in his discourses. For instance, he once said: The visual rays of an object enter in our eyes, whose only one part flashes in our eyes, resulting our unability to perceive an object so easy which is far from us. The rays of an object lying at a distance can be totally entered in our eyes and we can see it very closely, provided an instrument is invented, through which the rays of a farthest object can enter in the eyes, and then the camels in the desert, grazing at a distance of 3000 yards, will be seen at a distance of 60 yards. It means that the grazing camels will be seen 50 times nearer. This is perhaps the first correction of the theories of sight rays as expounded by Euclid (330-226 B.C.) and Ptolemy (9-168 A.D.), which were supposed to radiate out of eyes onto object. Later on, the theory of Jafar Sadik had been accepted after many experiments by the renowned scientist of Fatimids period, called Ibn al-Haytham (354-429/965-1039), known as Alhazen. His acclaimed treatise on optics, namely Kitab al-Manazir was translated into Latin under the title Opticae Thesaurus Alhazeni in 1270 by Witelo. Afterwards, it was published by Frederick Risner at Basel in 1572. According to Ibn al-Haytham, It is not a ray leaving the eyes that causes sight! It is far more the form of the perceived object that radiates onto the eye and is converted by its transparent body.
Posted on: Thu, 28 Nov 2013 09:49:02 +0000
Trending Topics
Recently Viewed Topics
© 2015