This page is optimized for large screens. Zooming may cause some display problems.

Parameters

Ir : intensity of the pontual source
dS : area of the surface element
d : distance from the source to the surface element
i : angle between the perpendicular to the surface and the direction from the ponctual source to the center of the surface element
Pr : optical power received by the surface element
Er : irradiance on the surface element