Q. Illumination of the sun at noon is maximum because
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
Explanation
(c) The intensity of illumination is given by
$I = \frac{P\cos\theta}{r^{2}}$
Where $P =$ power of the source
$r =$ distance between source and point
$\theta =$ angle of incidence
When $\theta = 0,I$ will be maximum. Hence, the rays from the sun are incident normally on the earth surface
Reviewed by Dr. Abubacker
Physics Educator & NEET/JEE Specialist
Ph.D. in Physics with 19+ years of teaching experience.