Which option is the correct formula to calculate/define illumination?
1
\(\frac{{\left( {CP } \right)}}{{flux\times\omega}}\)
2
\(\frac{{{{(Luminous\;flux)}^2}}}{{area}}\)
3
\(\frac{{\left( {CP \times \omega } \right)}}{{area}}\)
4
\(\frac{{\left( {CP \times \omega } \right)}}{{flux}}\)