The illumination is directly proportional to the cosine of the angle made by the normal to the illuminated surface with the direction of the incident flux. Above statement is associated with
- A. Planck's law
- B. Macbeth's law of illumination
- C. Bunsen's law of illumination
- D. Lambert's cosine law.
Answer: D. Lambert's cosine law.
Explanation: Lambert's cosine law states that illumination on any surface is directly proportional to the cosine of the angle between the normal to the surface and the direction of incident light rays: E = (I/r²) cos θ.