Proportional to incoming light by factor of cos theta
keliu
I realized that we have two ways of thinking about the Lambert's Law: the first way is to think that only the energy of the photon bounces vertical to the plane (parallel to the plane normal) contribute to the radiant energy flux density (E = \frac{\Phi cos\theta}{A}). The other way is to think that only the projection of the plane vertical to the light direction contribute to the irradiance (E = \frac{\Phi}{A / cos\theta}). Is there only a "correct" way to think about Lambert's Law between these two ways of thinking? Which is a better way to think about this law?
Proportional to incoming light by factor of cos theta
I realized that we have two ways of thinking about the Lambert's Law: the first way is to think that only the energy of the photon bounces vertical to the plane (parallel to the plane normal) contribute to the radiant energy flux density (E = \frac{\Phi cos\theta}{A}). The other way is to think that only the projection of the plane vertical to the light direction contribute to the irradiance (E = \frac{\Phi}{A / cos\theta}). Is there only a "correct" way to think about Lambert's Law between these two ways of thinking? Which is a better way to think about this law?