Alhazen’s experiments
Arabian physicist and mathematician Ibn Al-Haitam
(965-1039 A.D.), also known as Alhazen,
experimented with images seen through the
He arranged three candles in a row and put a screen with a small
hole between the candles and the wall. He noted that images were
formed only by means of small holes and that the candle to the
right made an image to the left on the wall.
From his observations he deduced the linearity of light.
He also described how to view a solar eclipse using a camera
obscura and was the first scientist to make this observation.