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.
A âturning pointâ is defined as a moment in which a critical decision must be made. This is the crossroads many of our clients reach when they contact Turning Point Programs (TPP). The program began in 1973 by The Salvation Army offering a refuge for West Michigan residents desiring to overcome active addictions.