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.
There are many things that make up a piece of art. However in order to make a piece of art into a masterpiece, there are several components that it must have. One of these components is a focal point. Definition Focus: âa. a center of activity, attraction, or attention b: a point of concentrationâ The focal point is the center of a piece of art. By center I donât mean literally center (although in many cases it is) but rather the most important part or parts of a piece. For example, if one were making an image of a bird sitting on a tree, the bird would probably be the focal point.