Definition:Solid Angle Subtended/Also presented as
Jump to navigation
Jump to search
Definition
Let $S$ be a surface oriented in space.
Let $P$ be a point in that space.
The solid angle subtended by $S$ at $P$ can also be presented as:
- $\ds \Omega = \iint_S \frac {\mathbf {\hat r} \cdot \mathbf {\hat n} \rd S} {r^2}$
where:
- $\mathbf {\hat r} = \dfrac {\mathbf r} r$ is the unit vector corresponding to the position vector $\mathbf r$ of the infinitesimal surface $\d S$ with respect to $P$
- $r$ is the magnitude of $\mathbf r$
- $\mathbf {\hat n}$ represents the unit normal to $\d S$.
Sources
- Weisstein, Eric W. "Solid Angle." From MathWorld--A Wolfram Web Resource. https://mathworld.wolfram.com/SolidAngle.html