Irradiance A light source is mounted on a plane area and emits 1W of radiometric power isotropically into the hemisphere. Which fraction of this power is received by a 10 × 10 μ  imaging sensor...

Irradiance

A light source is mounted on a plane area and emits 1W of radiometric power isotropically into the hemisphere. Which fraction of this power is received by a 10
×
10
μ
 imaging sensor element at a distance of 1m? How large is the irradiance of the sensor element?