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The illumination of various points on a horizontal surface illuminated by the same source varies as:
  • a)
    Cos θ
  • b)
    Cos2 θ
  • c)
    Cos3 θ
  • d)
    1/cos θ
Correct answer is option 'C'. Can you explain this answer?
Verified Answer
The illumination of various points on a horizontal surface illuminated...
The illumination of the surface is,
Where, h is the height of source from the surface in m
I is the luminous intensity on candela
The above equation is also known as cosine cube law. This law states that the illumination at any point on a surface is dependent on the cube of cosine of the angle between lines of flux and normal of that point.
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The illumination of various points on a horizontal surface illuminated...
The illumination of various points on a horizontal surface illuminated by the same source varies as the cosine of the angle of incidence.
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