Law Lambert’s Law
Lambert’s (cosine) law says that the radiant intensity observed from an ideal diffusely reflecting surface or ideal diffuse radiator is directly proportional to the cosine of the angle
Def Lambertian Surface A surface which obeys Lambert’s law is said to be Lambertian, and exhibits Lambertian reflectance.
Prop A Lambertian surface has the same radiance when viewed from any angle.
