Spherical reflection

It is assumed that the spherical surface is a fully diffused reflecting surface with reflectivity P. If the light source is most (LM) of the light source is installed in the ball, then the surface of the sphere directly to receive the luminous flux (LM). This flux is first PX after the surface is reflected. Then, after second times of reflection into P (Px). If the process is repeated several times in the sphere, as the result of mutual reflection, total luminous flux received within the sphere (or optical flux) can form a fixed formula.

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