A surface that is perpendicular to the sun receives maximum sun rays. A surface that is not perpendicular to the sun receives fewer sun rays or diminished intensity of sunlight. This is because the angle at which sunlight strikes the surface affects the concentration of solar energy that the surface absorbs. When sunlight hits a surface at a steep angle, it spreads over a larger area, reducing the energy per unit area.
A surface that is perpendicular to the sun receives blank sun rays. A surface that is not perpendicular to the sun receives blank sun rays
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