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Illumination- The luminous flux falling per unit area of a surface. Laws of Illumination: 1). Inverse square law- According to this law, the illumination of Laws of illumination . Photometry is useful, for example, to quantify Illumination (lighting) intended for human use. The SI units for both systems areThere are two laws of illumination: 1. Law of Inverse Squares 2. Lambert's Cosine Law. 1. Law of Inverse Squares: If a source of light which emits light Lambert's cosine law :- It states that when light fall obliquely on a surface, the illumination of the surface id directly proportional to the cosine of the There are two laws of Illuminations A. Law of Inverse Squares B. Lambert's Cosine Law Vijay Balu Raskar (B.E.Electrical) Define Standard of Illumination? State Inverse Square law of Illumination. Laws of Illumination pdf/L-5(NKK)(IE)%20((EE)NPTEL).pdf.