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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. The above statement is associated with

  • 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. The above statement is associated with Lambert's cosine law.
  • Lambert's cosine law, also known as the cosine emission law or Lambert's law, states that the illumination or brightness of a surface is directly proportional to the cosine of the angle between the normal to the surface and the direction of the incident light.
  • This means that the amount of light falling on a surface decreases as the angle between the surface and the incident light increases.