Al Haytham did the theoretical work on magnification around 1000AD and (in theory) knew how to make a telescope-like magnifying lens, but there is no proof he ever did, and no one knew how to make glass of sufficient clarity anyway. (You are correct, and I give you this bonus fact.)
October 13, 2026 at 3:36 PM
Al Haytham did the theoretical work on magnification around 1000AD and (in theory) knew how to make a telescope-like magnifying lens, but there is no proof he ever did, and no one knew how to make glass of sufficient clarity anyway. (You are correct, and I give you this bonus fact.)
(Also: Arabic is a language, not a people, the demonym would be Arab. Which he wasn't, but his family was so maybe he called himself that? Given when and where he was born al Haytham would technically have been a Buyid, but that barely means anything to anyone west of Istanbul.)
October 13, 2026 at 8:51 PM
(Also: Arabic is a language, not a people, the demonym would be Arab. Which he wasn't, but his family was so maybe he called himself that? Given when and where he was born al Haytham would technically have been a Buyid, but that barely means anything to anyone west of Istanbul.)
👤 Creator: Taoufik Alsaadi, Abubaker Almadani, Suhail Al-Rukn, Alessandro Terruzzi, Ali Mohamed Hassan, Osama Robin El-Alamy, Ali Al Balushi, Fatema Abdullah, Nadine Tarcha, Haytham Mohamed Ahmed, Mohamed Hegab
October 10, 2026 at 8:34 AM
👤 Creator: Taoufik Alsaadi, Abubaker Almadani, Suhail Al-Rukn, Alessandro Terruzzi, Ali Mohamed Hassan, Osama Robin El-Alamy, Ali Al Balushi, Fatema Abdullah, Nadine Tarcha, Haytham Mohamed Ahmed, Mohamed Hegab
New episode: What if Ibn al-Haytham woke up in 2026? He sat in a dark room with one tiny hole in the wall. Can you guess what appeared on the opposite wall? Take the quiz.
https://youtu.be/zbo8E6qlCK4
#history #animation
https://youtu.be/zbo8E6qlCK4
#history #animation
October 9, 2026 at 11:56 AM
New episode: What if Ibn al-Haytham woke up in 2026? He sat in a dark room with one tiny hole in the wall. Can you guess what appeared on the opposite wall? Take the quiz.
https://youtu.be/zbo8E6qlCK4
#history #animation
https://youtu.be/zbo8E6qlCK4
#history #animation
Ibn al-Haytham: Bapa Optik Moden yang Membongkar Rahsia Penglihatan Manusia
Ibn al-Haytham, seorang saintis Islam dari Zaman Keemasan, merevolusikan pemahaman tentang penglihatan dengan membuktikan bahawa mata menerima cahaya dari objek, bukan memancarkann
Ibn al-Haytham, seorang saintis Islam dari Zaman Keemasan, merevolusikan pemahaman tentang penglihatan dengan membuktikan bahawa mata menerima cahaya dari objek, bukan memancarkann
Ibn al-Haytham: Bapa Optik Moden yang Membongkar Rahsia Penglihatan Manusia
Ibn al-Haytham, seorang saintis Islam dari Zaman Keemasan, merevolusikan pemahaman tentang penglihatan dengan membuktikan bahawa mata menerima cahaya dari objek, bukan memancarkannya. Melalui eksperimen dan penaakulan matematik, beliau menulis 'Kitab Optik' yang menjadi asas sains optik moden. Waris
khatulistiwa.org
October 6, 2026 at 12:02 PM
Ibn al-Haytham: Bapa Optik Moden yang Membongkar Rahsia Penglihatan Manusia
Ibn al-Haytham, seorang saintis Islam dari Zaman Keemasan, merevolusikan pemahaman tentang penglihatan dengan membuktikan bahawa mata menerima cahaya dari objek, bukan memancarkann
Ibn al-Haytham, seorang saintis Islam dari Zaman Keemasan, merevolusikan pemahaman tentang penglihatan dengan membuktikan bahawa mata menerima cahaya dari objek, bukan memancarkann
Ibn al-Haytham: Bapa Optik Moden yang Membongkar Rahsia Penglihatan Manusia
Ibn al-Haytham, seorang saintis Islam dari Zaman Keemasan, merevolusikan pemahaman tentang penglihatan dengan membuktikan bahawa mata menerima cahaya dari objek, bukan memancarkann
Ibn al-Haytham, seorang saintis Islam dari Zaman Keemasan, merevolusikan pemahaman tentang penglihatan dengan membuktikan bahawa mata menerima cahaya dari objek, bukan memancarkann
Ibn al-Haytham: Bapa Optik Moden yang Membongkar Rahsia Penglihatan Manusia
Ibn al-Haytham, seorang saintis Islam dari Zaman Keemasan, merevolusikan pemahaman tentang penglihatan dengan membuktikan bahawa mata menerima cahaya dari objek, bukan memancarkannya. Melalui eksperimen dan penaakulan matematik, beliau menulis 'Kitab Optik' yang menjadi asas sains optik moden. Waris
khatulistiwa.org
October 2, 2026 at 1:37 PM
Ibn al-Haytham: Bapa Optik Moden yang Membongkar Rahsia Penglihatan Manusia
Ibn al-Haytham, seorang saintis Islam dari Zaman Keemasan, merevolusikan pemahaman tentang penglihatan dengan membuktikan bahawa mata menerima cahaya dari objek, bukan memancarkann
Ibn al-Haytham, seorang saintis Islam dari Zaman Keemasan, merevolusikan pemahaman tentang penglihatan dengan membuktikan bahawa mata menerima cahaya dari objek, bukan memancarkann
...highlights thinkers such as al-Biruni, Ibn al-Haytham, & Nasir al-Din al-Tusi and how their work transformed & shaped astronomy. Designed for formal/informal educators, this workshop introduces participants to Al Jauza, an educational platform sharing the rich heritage of the Islamic world.
October 1, 2026 at 12:48 AM
...highlights thinkers such as al-Biruni, Ibn al-Haytham, & Nasir al-Din al-Tusi and how their work transformed & shaped astronomy. Designed for formal/informal educators, this workshop introduces participants to Al Jauza, an educational platform sharing the rich heritage of the Islamic world.
Ibn al-Haytham dan Revolusi Optik: Membuka Tabir Cahaya
Peradaban Islam mencatatkan lonjakan besar dalam sejarah optik melalui karya besar Ibn al-Haytham, Kitab al-Manazir. Beliau membuktikan bahwa cahaya bergerak dalam garis lurus dan
Peradaban Islam mencatatkan lonjakan besar dalam sejarah optik melalui karya besar Ibn al-Haytham, Kitab al-Manazir. Beliau membuktikan bahwa cahaya bergerak dalam garis lurus dan
Ibn al-Haytham dan Revolusi Optik: Membuka Tabir Cahaya
Peradaban Islam mencatatkan lonjakan besar dalam sejarah optik melalui karya besar Ibn al-Haytham, Kitab al-Manazir. Beliau membuktikan bahwa cahaya bergerak dalam garis lurus dan penglihatan terjadi ketika cahaya memasuki mata, bukan sebaliknya. Penemuan ini mengubah teori optik Yunani kuno dan men
khatulistiwa.org
September 26, 2026 at 11:34 AM
Ibn al-Haytham dan Revolusi Optik: Membuka Tabir Cahaya
Peradaban Islam mencatatkan lonjakan besar dalam sejarah optik melalui karya besar Ibn al-Haytham, Kitab al-Manazir. Beliau membuktikan bahwa cahaya bergerak dalam garis lurus dan
Peradaban Islam mencatatkan lonjakan besar dalam sejarah optik melalui karya besar Ibn al-Haytham, Kitab al-Manazir. Beliau membuktikan bahwa cahaya bergerak dalam garis lurus dan
Ibn al-Haytham: El padre de la óptica moderna que reveló el secreto de la visión humana
Ibn al-Haytham, un científico islámico de la Edad de Oro, revolucionó la comprensión de la visión demostrando que los ojos reciben luz de los objetos, no que la emiten. A través de
Ibn al-Haytham, un científico islámico de la Edad de Oro, revolucionó la comprensión de la visión demostrando que los ojos reciben luz de los objetos, no que la emiten. A través de
Ibn al-Haytham: El padre de la óptica moderna que reveló el secreto de la visión humana
Ibn al-Haytham, un científico islámico de la Edad de Oro, revolucionó la comprensión de la visión demostrando que los ojos reciben luz de los objetos, no que la emiten. A través de experimentos y razonamiento matemático, escribió 'El Libro de la Óptica', que se convirtió en la base de la óptica mode
khatulistiwa.org
September 20, 2026 at 5:05 PM
Ibn al-Haytham: El padre de la óptica moderna que reveló el secreto de la visión humana
Ibn al-Haytham, un científico islámico de la Edad de Oro, revolucionó la comprensión de la visión demostrando que los ojos reciben luz de los objetos, no que la emiten. A través de
Ibn al-Haytham, un científico islámico de la Edad de Oro, revolucionó la comprensión de la visión demostrando que los ojos reciben luz de los objetos, no que la emiten. A través de
The first two buyers get a 38% discount!
Guys, the first chapter of the Halloween minicomic is now on sale. Along with the page, you'll get access to the step-by-step instructions for this work.
#patreon #genshin #genshinimpact #Kaveh #Diluc #Keya #Al-Haytham
www.patreon.com/Litovans/pos...
Guys, the first chapter of the Halloween minicomic is now on sale. Along with the page, you'll get access to the step-by-step instructions for this work.
#patreon #genshin #genshinimpact #Kaveh #Diluc #Keya #Al-Haytham
www.patreon.com/Litovans/pos...
Page 1 of the Halloween minicomic🎃 The full page and sequel are also available for purchase. | Litovans
Page 1 of the Halloween minicomic🎃 The full page and sequel are also available for purchase. by Litovans on Patreon. Join Litovans's community for exclusive content and updates.
www.patreon.com
September 19, 2026 at 10:09 AM
The first two buyers get a 38% discount!
Guys, the first chapter of the Halloween minicomic is now on sale. Along with the page, you'll get access to the step-by-step instructions for this work.
#patreon #genshin #genshinimpact #Kaveh #Diluc #Keya #Al-Haytham
www.patreon.com/Litovans/pos...
Guys, the first chapter of the Halloween minicomic is now on sale. Along with the page, you'll get access to the step-by-step instructions for this work.
#patreon #genshin #genshinimpact #Kaveh #Diluc #Keya #Al-Haytham
www.patreon.com/Litovans/pos...
Sebelum Galileo, Ada Jejak Ibnu Al-Haytham dalam Penemuan Kacamata atau Teleskop Diakui UNESCO - https://khazanah.republika.co.id/berita/tlile1320/sebelum-galileo-ada-jejak-ibnu-alhaytham-dalam-penemuan-kacamata-atau-teleskop-diakui-unesco
Sebelum Galileo, Ada Jejak Ibnu Al-Haytham dalam Penemuan Kacamata atau Teleskop Diakui UNESCO |Republika Online
Ibnu Al-Haytham memiliki karya yang diakui dunia.
republika.co.id
September 17, 2026 at 4:04 PM
Sebelum Galileo, Ada Jejak Ibnu Al-Haytham dalam Penemuan Kacamata atau Teleskop Diakui UNESCO - https://khazanah.republika.co.id/berita/tlile1320/sebelum-galileo-ada-jejak-ibnu-alhaytham-dalam-penemuan-kacamata-atau-teleskop-diakui-unesco
The first scientist's guide to truth – Alhazen on critical thinking, even more needed 1,000 years later www.themarginalian.org/2022/11/14/a...
The First Scientist’s Guide to Truth: Alhazen on Critical Thinking
Born into a world with no clocks, telescopes, microscopes, or democracy, Ḥasan Ibn al-Haytham (c. 965–c. 1040), known in the West as Alhazen, began his life studying religion, but grew quickl…
www.themarginalian.org
September 15, 2026 at 2:15 AM
The first scientist's guide to truth – Alhazen on critical thinking, even more needed 1,000 years later www.themarginalian.org/2022/11/14/a...
Al-Razi became Rhazes. Al-Zahrawi became Abulcasis. Ibn Rushd became Averroes. Ibn al-Haytham became Alhazen.
These are not translations. They are replacements. The Latinized name entered the European canon. The original name, and everything it carried about who these scholars
These are not translations. They are replacements. The Latinized name entered the European canon. The original name, and everything it carried about who these scholars
September 13, 2026 at 4:29 AM
Al-Razi became Rhazes. Al-Zahrawi became Abulcasis. Ibn Rushd became Averroes. Ibn al-Haytham became Alhazen.
These are not translations. They are replacements. The Latinized name entered the European canon. The original name, and everything it carried about who these scholars
These are not translations. They are replacements. The Latinized name entered the European canon. The original name, and everything it carried about who these scholars
📢 Additional footage from the funeral of the Khan Yunis Brigade Commander, Abu Al-Haytham, shows participants calling out, “October 7 is a holiday.” The video was provided by the "Khalifa Shrugged" channel.
September 11, 2026 at 5:29 PM
📢 Additional footage from the funeral of the Khan Yunis Brigade Commander, Abu Al-Haytham, shows participants calling out, “October 7 is a holiday.” The video was provided by the "Khalifa Shrugged" channel.
Muhammad al-Yazuri, known as Abu al-Haytham, commander of Hamas's Khan Yunis Brigade, was killed in a drone strike in al-Mawasi overnight. Hamas engineer Hudhaifa Abu Muammar was also killed. A separate strike killed field commander Mo'men Abu Labda in Hamad City. (2/3)
September 11, 2026 at 7:25 AM
Muhammad al-Yazuri, known as Abu al-Haytham, commander of Hamas's Khan Yunis Brigade, was killed in a drone strike in al-Mawasi overnight. Hamas engineer Hudhaifa Abu Muammar was also killed. A separate strike killed field commander Mo'men Abu Labda in Hamad City. (2/3)
🧵 1/3 · 📢 Significant elimination tonight in the Gaza Strip: The commander of the Khan Yunis Brigade in Hamas was eliminated. In an overnight strike on a group of people near the Al-Quba Mosque in Khan Yunis, Mohammad Al-Yazouri, Abu Al-Haytham,
September 11, 2026 at 5:42 AM
🧵 1/3 · 📢 Significant elimination tonight in the Gaza Strip: The commander of the Khan Yunis Brigade in Hamas was eliminated. In an overnight strike on a group of people near the Al-Quba Mosque in Khan Yunis, Mohammad Al-Yazouri, Abu Al-Haytham,
El Descubridor de los Secretos de la Luz: Ibn al-Haytham y la Revolución Óptica Islámica
La civilización islámica marcó un gran salto en la historia de la ciencia óptica a través del gran personaje Ibn al-Haytham. Con un enfoque experimental revolucionario, él desveló
La civilización islámica marcó un gran salto en la historia de la ciencia óptica a través del gran personaje Ibn al-Haytham. Con un enfoque experimental revolucionario, él desveló
El Descubridor de los Secretos de la Luz: Ibn al-Haytham y la Revolución Óptica Islámica
La civilización islámica marcó un gran salto en la historia de la ciencia óptica a través del gran personaje Ibn al-Haytham. Con un enfoque experimental revolucionario, él desveló los secretos de la luz y la visión, rechazó las teorías antiguas griegas y sentó las bases de la física moderna. Este ar
khatulistiwa.org
September 9, 2026 at 2:34 PM
El Descubridor de los Secretos de la Luz: Ibn al-Haytham y la Revolución Óptica Islámica
La civilización islámica marcó un gran salto en la historia de la ciencia óptica a través del gran personaje Ibn al-Haytham. Con un enfoque experimental revolucionario, él desveló
La civilización islámica marcó un gran salto en la historia de la ciencia óptica a través del gran personaje Ibn al-Haytham. Con un enfoque experimental revolucionario, él desveló
Refutation: Intromission theory.
Ibn al-Haytham proposed & proved the physical operation as we accept today; light enters the eye carrying the forms of the world. This truncates the perceptive mental functions mentioned, such as selectivity. ...
Ibn al-Haytham proposed & proved the physical operation as we accept today; light enters the eye carrying the forms of the world. This truncates the perceptive mental functions mentioned, such as selectivity. ...
September 5, 2026 at 7:13 PM
Refutation: Intromission theory.
Ibn al-Haytham proposed & proved the physical operation as we accept today; light enters the eye carrying the forms of the world. This truncates the perceptive mental functions mentioned, such as selectivity. ...
Ibn al-Haytham proposed & proved the physical operation as we accept today; light enters the eye carrying the forms of the world. This truncates the perceptive mental functions mentioned, such as selectivity. ...
You are a jar of five souls:
Al-Khwarizmi, 850, ran the House of Wisdom.
Al-Battani, 929, calculated the Solar Year.
Ibn al-Haytham, 1040, wrote the Book of Optics.
Nasir al-Din al-Tusi, 1274, found the Law of Sines.
Mohammed Baqir Yazdi, 1639, whom Euler stole from:
help me with this spreadsheet!
Al-Khwarizmi, 850, ran the House of Wisdom.
Al-Battani, 929, calculated the Solar Year.
Ibn al-Haytham, 1040, wrote the Book of Optics.
Nasir al-Din al-Tusi, 1274, found the Law of Sines.
Mohammed Baqir Yazdi, 1639, whom Euler stole from:
help me with this spreadsheet!
you heard it here first: AI is useless until it can do literal necromancy
Joining the war against cancer on the side of cancer
September 2, 2026 at 8:28 AM
You are a jar of five souls:
Al-Khwarizmi, 850, ran the House of Wisdom.
Al-Battani, 929, calculated the Solar Year.
Ibn al-Haytham, 1040, wrote the Book of Optics.
Nasir al-Din al-Tusi, 1274, found the Law of Sines.
Mohammed Baqir Yazdi, 1639, whom Euler stole from:
help me with this spreadsheet!
Al-Khwarizmi, 850, ran the House of Wisdom.
Al-Battani, 929, calculated the Solar Year.
Ibn al-Haytham, 1040, wrote the Book of Optics.
Nasir al-Din al-Tusi, 1274, found the Law of Sines.
Mohammed Baqir Yazdi, 1639, whom Euler stole from:
help me with this spreadsheet!
Ibn al-Haytham: Bapa Optik Moden yang Membongkar Rahsia Penglihatan Manusia
Ibn al-Haytham, seorang saintis Islam dari Zaman Keemasan, merevolusikan pemahaman tentang penglihatan dengan membuktikan bahawa mata menerima cahaya dari objek, bukan memancarkann
Ibn al-Haytham, seorang saintis Islam dari Zaman Keemasan, merevolusikan pemahaman tentang penglihatan dengan membuktikan bahawa mata menerima cahaya dari objek, bukan memancarkann
Ibn al-Haytham: Bapa Optik Moden yang Membongkar Rahsia Penglihatan Manusia
Ibn al-Haytham, seorang saintis Islam dari Zaman Keemasan, merevolusikan pemahaman tentang penglihatan dengan membuktikan bahawa mata menerima cahaya dari objek, bukan memancarkannya. Melalui eksperimen dan penaakulan matematik, beliau menulis 'Kitab Optik' yang menjadi asas sains optik moden. Waris
khatulistiwa.org
August 31, 2026 at 9:17 PM
Ibn al-Haytham: Bapa Optik Moden yang Membongkar Rahsia Penglihatan Manusia
Ibn al-Haytham, seorang saintis Islam dari Zaman Keemasan, merevolusikan pemahaman tentang penglihatan dengan membuktikan bahawa mata menerima cahaya dari objek, bukan memancarkann
Ibn al-Haytham, seorang saintis Islam dari Zaman Keemasan, merevolusikan pemahaman tentang penglihatan dengan membuktikan bahawa mata menerima cahaya dari objek, bukan memancarkann
Ibn al-Haytham: Bapa Optik Moden yang Membongkar Rahsia Penglihatan Manusia
Ibn al-Haytham, seorang saintis Islam dari Zaman Keemasan, merevolusikan pemahaman tentang penglihatan dengan membuktikan bahawa mata menerima cahaya dari objek, bukan memancarkann
Ibn al-Haytham, seorang saintis Islam dari Zaman Keemasan, merevolusikan pemahaman tentang penglihatan dengan membuktikan bahawa mata menerima cahaya dari objek, bukan memancarkann
Ibn al-Haytham: Bapa Optik Moden yang Membongkar Rahsia Penglihatan Manusia
Ibn al-Haytham, seorang saintis Islam dari Zaman Keemasan, merevolusikan pemahaman tentang penglihatan dengan membuktikan bahawa mata menerima cahaya dari objek, bukan memancarkannya. Melalui eksperimen dan penaakulan matematik, beliau menulis 'Kitab Optik' yang menjadi asas sains optik moden. Waris
khatulistiwa.org
August 27, 2026 at 11:41 AM
Ibn al-Haytham: Bapa Optik Moden yang Membongkar Rahsia Penglihatan Manusia
Ibn al-Haytham, seorang saintis Islam dari Zaman Keemasan, merevolusikan pemahaman tentang penglihatan dengan membuktikan bahawa mata menerima cahaya dari objek, bukan memancarkann
Ibn al-Haytham, seorang saintis Islam dari Zaman Keemasan, merevolusikan pemahaman tentang penglihatan dengan membuktikan bahawa mata menerima cahaya dari objek, bukan memancarkann
O Desvendador dos Segredos da Luz: Ibn al-Haytham e a Revolução Óptica Islâmica
A civilização islâmica marcou um grande salto na história da ciência da óptica através da figura magnânima de Ibn al-Haytham. Com uma abordagem experimental revolucionária, ele des
A civilização islâmica marcou um grande salto na história da ciência da óptica através da figura magnânima de Ibn al-Haytham. Com uma abordagem experimental revolucionária, ele des
O Desvendador dos Segredos da Luz: Ibn al-Haytham e a Revolução Óptica Islâmica
A civilização islâmica marcou um grande salto na história da ciência da óptica através da figura magnânima de Ibn al-Haytham. Com uma abordagem experimental revolucionária, ele desvendou os segredos da luz e da visão, rejeitando as teorias antigas gregas e estabelecendo as bases da física moderna. E
khatulistiwa.org
August 19, 2026 at 1:29 AM
O Desvendador dos Segredos da Luz: Ibn al-Haytham e a Revolução Óptica Islâmica
A civilização islâmica marcou um grande salto na história da ciência da óptica através da figura magnânima de Ibn al-Haytham. Com uma abordagem experimental revolucionária, ele des
A civilização islâmica marcou um grande salto na história da ciência da óptica através da figura magnânima de Ibn al-Haytham. Com uma abordagem experimental revolucionária, ele des
Ibn al-Haytham y la Revolución Óptica: Desvelando la Luz
La civilización islámica registró un gran avance en la historia de la óptica a través de la obra magna de Ibn al-Haytham, Kitab al-Manazir. Él demostró que la luz se mueve en línea
La civilización islámica registró un gran avance en la historia de la óptica a través de la obra magna de Ibn al-Haytham, Kitab al-Manazir. Él demostró que la luz se mueve en línea
Ibn al-Haytham y la Revolución Óptica: Desvelando la Luz
La civilización islámica registró un gran avance en la historia de la óptica a través de la obra magna de Ibn al-Haytham, Kitab al-Manazir. Él demostró que la luz se mueve en línea recta y la visión ocurre cuando la luz entra en el ojo, en lugar de lo contrario. Esta descubrimiento cambió la teoría
khatulistiwa.org
August 18, 2026 at 3:01 AM
Ibn al-Haytham y la Revolución Óptica: Desvelando la Luz
La civilización islámica registró un gran avance en la historia de la óptica a través de la obra magna de Ibn al-Haytham, Kitab al-Manazir. Él demostró que la luz se mueve en línea
La civilización islámica registró un gran avance en la historia de la óptica a través de la obra magna de Ibn al-Haytham, Kitab al-Manazir. Él demostró que la luz se mueve en línea
Ibn al-Haytham and the Optical Revolution: Unveiling Light
The Islamic civilization recorded a major breakthrough in the history of optics through the monumental work of Ibn al-Haytham, Kitab al-Manazir. He proved that light moves in a str
The Islamic civilization recorded a major breakthrough in the history of optics through the monumental work of Ibn al-Haytham, Kitab al-Manazir. He proved that light moves in a str
Ibn al-Haytham and the Optical Revolution: Unveiling Light
The Islamic civilization recorded a major breakthrough in the history of optics through the monumental work of Ibn al-Haytham, Kitab al-Manazir. He proved that light moves in a straight line and vision occurs when light enters the eye, not the other way around. This discovery transformed ancient Gre
khatulistiwa.org
August 15, 2026 at 6:57 PM
Ibn al-Haytham and the Optical Revolution: Unveiling Light
The Islamic civilization recorded a major breakthrough in the history of optics through the monumental work of Ibn al-Haytham, Kitab al-Manazir. He proved that light moves in a str
The Islamic civilization recorded a major breakthrough in the history of optics through the monumental work of Ibn al-Haytham, Kitab al-Manazir. He proved that light moves in a str