# 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, together with the diameter of the circle, subtends two equal angles. And every ray which is reflected from a polished object to a point produces a certain heating at that point, so that if numerous rays are collected at one point, the heating at that point is multiplied: and if the number of rays increases, the effect of the heat increases accordingly.

## Notes:

Alhazan's famous observations on reflecting the sun's rays and bending light.

**Folksonomies:** history science optics reflection

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/home and garden/home furnishings/lamps and lighting (0.248943)

/business and industrial/energy/electricity (0.209338)

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ray subtends:Person (0.874062 (neutral:0.000000)), ray:Person (0.599631 (neutral:0.000000))

**Concepts:**

Euclidean geometry (0.969363): dbpedia | freebase

Circle (0.915368): dbpedia | freebase | opencyc

Line (0.736381): dbpedia | freebase

Plane (0.715563): dbpedia | freebase

Line segment (0.700093): dbpedia | freebase | opencyc

Analytic geometry (0.637254): dbpedia | freebase

Radius (0.585310): dbpedia | freebase

Light (0.574077): dbpedia | freebase | opencyc

**A Discourse of the Concave Spherical Mirror by Ibn Al-Haitham**

**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