Ibn al-Haytham

Ibn al-Haytham, also known as Alhazen, was a prominent mathematician, physicist, and astronomer during the Islamic Golden Age, born around the year nine hundred sixty-five in Basra, present-day Iraq. His groundbreaking work in optics earned him the title of 'the father of modern optics.' His most significant contribution, the 'Kitāb al-Manāẓir' or 'Book of Optics,' was penned between the years one thousand eleven and one thousand twenty-one and has had a lasting impact on the field, influencing notable figures such as Galileo Galilei and Johannes Kepler during the Scientific Revolution.

Alhazen's innovative approach to vision was revolutionary; he was the first to demonstrate that vision is intromissive rather than extramissive, asserting that it occurs in the brain and is influenced by personal experience. His exploration of light led to the formulation of the principle of least time for refraction, which would later be recognized as Fermat's principle. His extensive studies in catoptrics and dioptrics laid the groundwork for understanding reflection, refraction, and the nature of images formed by light rays.

Beyond his contributions to optics, Ibn al-Haytham was a polymath who delved into philosophy, theology, and medicine. He spent a significant portion of his career in Cairo, where he authored numerous treatises and tutored members of the nobility. His commitment to the scientific method, emphasizing the necessity of experimental support for hypotheses, positioned him as a pioneer in scientific inquiry, predating the Renaissance by several centuries.

Often referred to by the bynames al-Baṣrī, after his birthplace, and al-Miṣrī, meaning 'the Egyptian,' Ibn al-Haytham was recognized as the 'Second Ptolemy' by Abu'l-Hasan Bayhaqi and dubbed 'The Physicist' by John Peckham. His legacy continues to influence the modern science of physical optics, marking him as one of the most significant figures in the history of science.