**Periodicals>**

**Journal Article:**Al-Haitham, Ibn and Winter, H. J. J. (1950)

*, A Discourse of the Concave Spherical Mirror by Ibn Al-Haitham*, Journal of the Royal Asiatic Society of Bengal, 16, 2., Retrieved on 2011-09-03

**Folksonomies:**optics

## Memes

03 SEP 2011

## Focusing Light Increases Heat Where Focused

The sun's rays proceed from the sun along straight lines and are reflected from every polished object at equal angles, i.e. the reflected ray subtends, together with the line tangential to the polished object which is in the plane of the reflected ray, two equal angles. Hence it follows that the ray reflected from the spherical surface, together with the circumference of the circle which is in the plane of the ray, subtends two equal angles. From this it also follows that the reflected ray, t...Alhazan's famous observations on reflecting the sun's rays and bending light.