Solid angle

solid angle

Solid angle
The quantity solid angle (denoted by the Greek letter Ω) is a measure of the field of view that a given object covers. The coresponding unit is steradian (sr).

In the Figure, the solid angle subtended by the area A (in m2) on the surface of the sphere with radius r (in m) is:

Ω = A × r -2

The solid angle subtended by the whole sphere measered from its interior is 4π sr.

Related quantity

  • angle

» back to lexicon A - Z