As the distance from a point source of radiation increases, the irradiance decreases. The relationship between irradiance, \(I\), and distance, \(d\), can be shown to follow an inverse square law.

“The non-uniformity of the irradiance and the spectral impact are considered by using a four-dimensional matrix as the base unit to perform annual farm simulation,” they said. “The first and ...

A lamp illuminates a screen of area \(2.0m^{2}\), which is \(4 m\) away. The irradiance at the screen is \(0.02Wm^{-2}\). a) Calculate the power of the incident beam. b) If the screen is moved to ...