# Advanced Geometry by H.C. Rajpoot-2014

**Geometry**Level 3

A uniform point-source of light is located at a point \(\left(0,0,-a\right)\) in the space. Find the fraction of total radiation, intercepted by a plane bounded by the straight lines

\[\begin{align} x&=0\\ x&=a\\ y&=0\\ y&=a \end{align}\]

\(\forall a>0\).