Ibn al-Haytham

Is Abu Ali al-Hasan ibn al-Haytham, and engineer, who died in the optical e 430, was born in Basra in 354 AH probably. He moved to Egypt, where he stayed until his death. According to the book (news wise) for Al-gafti on the lips of Ibn al-Haytham: (if you worked in Egypt for its achievement pursuant to get benefit in each of the cases of the increase and decrease). Bringing saying this to the ruler of Egypt, the Fatimid caliph Al-Hakim, so he sent him some money secretly, and asked him to come to Egypt Ibn al-Haytham Patriarch agreed to the request and traveled to Egypt, where the Governor ordered him to accomplish what God promised. Ibn al-Haytham began to study the river along its course, and what amounted to descend near Aswan Nile water goes into it in all its aspects, he realized that he was delusional and hasty in what he claimed estimated and that he is unable to fulfill his promise. Then returned to the Governor, apologizing for God, before the excuse and otherwise one of the seats However, Ibn al-Haytham thought the ruling pretended satisfaction satisfied, it was feared that Liquide him, and pretended to go mad, and persisted in the demonstration until the death of the Fatimid period. After his death, he returned to pretend madness, and out of his home, and dwelt on the door of the Dome of the Al-Azhar mosque, rolled up the rest of his authors and investigators and researchers in the fields of science, was his tremendous achievements.

And is described by Ibn Abi Usaibia in his book (the eyes of the news in the layers of doctors) says: (Ibn al-Haytham was the preferred defense, a strong intellect, broad knowledge, not matched by one of the people of his time in sports science, and some of it. He was always engaging, many of classification, a multitude asceticism ...).

Ibn al-Haytham large number of books covering various purposes of science The most important of these books: Book of Optics, Book of the Whole of the assets of the account, the user account transactions, the authors explain the origins of Euclid in geometry and number, the user in the analysis of engineering problems, the book forms the Crescent, an article in the analysis and synthesis, an article in circles Brcar bone, an article in properties of the triangle on the column, an article in the light, an article in the Holocaust mirrors, an article in the mirrors of the Holocaust Chambers, an article in the ball of the Holocaust, an article on how the shadows, an article in the Indian account, the question in the space, is of the ball, a book in the halo and the Rainbow , a picture book eclipse, the moon differing views, see the planets and the moon landscape, called the True account, altitudes of the planets, a book in the world. Some argue that Ibn al-Haytham to leave books in theology, medicine, philosophy, and others.

The Book of Optics was a revolution in the world of optics; Son of al-Haytham did not adopt the theories of Ptolemy being suck by some modification, but rejected a number of theories in the science of light, after reaching new theories became the nucleus of modern optics. We are trying to stop at the following main views contained in the book:

• Ptolemy claimed that the vision is done by the radiation emitted from the eye to the visible object; Subsequent scholars have adopted this theory. As Ibn al-Haytham came to blow up this theory in the book scenes, he said that the vision is done by the radiation emitted from the visible object at eye sighted.

• After a series of tests conducted by Ibn al-Haytham showed that the optical beam spread in a straight line within the central homogeneous.

• Ibn al-Haitham discovered the phenomenon of reflection of light, and the phenomenon of turning light any deviation from the photo place in the event of the passage of light rays in the center to the center of a particular non-homogeneous with him. The smaller the hole, if passed light rays in accordance with the angle from the center to the center of another non-homogeneous with him.

• Development of Ibn al-Haytham research in relation to zoom lenses, and thus paved the way for the use of lenses in dealing with various eye defects.

• The most important achievements of Ibn al-Haitham eye autopsy, it was explained fully, and the functionality of each section.

Reached Ibn al-Haytham to find his way that they are sight sighted, if they wanted to compare the two bodies after one of his eyesight is not connected by an object is visible, it would seem that his two closest is run, and the longer is the closest. For example, if he was standing in a vast plain extends to the horizon, and if see the city in the horizon (ground up the body of a visual tool sight in the city), and if he sees at the same time overlooking the moon over the mountain close to it (no visible body up sight tool the moon), the moon in this case seems closer to him and two of the city.