User: The greenhouse effect is a result of A. absorption and radiation of energy in the hydrosphere. B. consumption of fruits and vegetables that produce a biofuel. C. absorption and radiation of energy in the atmosphere.
A principal focus or focal point is a special focus: 1  For a lens, or a spherical or parabolic mirror, it is a point onto which collimated light parallel to the axis is focused. Since light can pass through a lens in either direction, a lens has two focal pointsâone on each side.
Definition of Focal Point in Art. The focal point is the center of interest or activity in a work of art. It may or may not be the actual center of a painting or drawing, but it is always the most important part. Contrast, structure and color are three things that help define the focal point. Focal Point in Your Drawings