A) scattering is reduced at noon
B) refraction of light is minimum at noon
C) rays are incident almost normally
D) the sun is nearer to earth at noon
Correct Answer: C
Solution :
The intensity of illumination is given by \[I=\frac{P\cos \,}{{{r}^{2}}}\] ?(1) where P = power of the source r= distance between source and point \[=\] angle of incidence when \[\,\text{=}\,0,\,I\] will be maximum. Hence the rays from the sun are incident normally on the earth surface.
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