engineering recuitment UPPCL Technician Electrician 2022 Mock Test Electrician and Wireman Light and Illumination
If 'CP' is candle power of source at a height 'H' and 'D' is distance between the source and a point where D > H, then illumination vertically below the source is
1
\(\frac {CP} {H}\)
2
\(\frac {CP} {D}\)
3
\(\frac {CP} {D^2}\)
4
\(\frac {CP} {H^2}\)