Print the cut-out sheet, preferably on 250 grams paper. Otherwise glue three ordinary paper sheets. Link the components with brass fasteners.
Make the three introductory assignments in the handout in a drawing programme such as Paint and send the answers to h.hietbrinkplanet.nl.
This lecture has been presented at the The First International Prof. Dr. Fuat Sezgin History of Science in Islam Symposium in Istanbul in 2019. My contribution to the conference proceedings are available. A translation into Turkish was sponsored by Bursa Science Center.
Although the instrument is attributed to Leonardo da Vinci, the main actor is Ibn al-Haytham. Ibn al-Haytham (965-1041), born in Basra (Iraq) made great progress in understanding the phenomenon of light. With experimental setups he examined the reflection of light in mirrors, not only flat, but also in curved or cone-shaped mirrors. The Dictionary of Scientific Biography is a reliable source of information on the life and works of Ibn al-Haytham. A long list of sources is available on my web page.
On the Shape of the Eclipse
Did you ever wonder how the shape of the eclipse would look like in a camera obscura?
Did you ever asked yourself why the shape of a crescent moon becomes a circle in a camera obscura?
Ibn al-Haytham was the first scientist who gave a correct mathematical explanation in his treatise On the Shape of the Eclipse.
Use the slider to examine the different mirrors: flat, convex circle, concave circle, convex ellipse or concave ellipse. You can choose where the eye and the light source are situated with respect to the mirror. You can set the viewing direction with the movable point on the circle around the eye. With the buttons you can choose to make the drawing instrument visible or show the geometric location of the reflection points.