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 two main types of anchor points: 1) Smooth points â A smooth point is made up of two linked control handles and help prevent the path from changing direction abruptly. 2) Corner Points â A corner point helps the path change direction. There are three different types of corner anchor points. a) Straight corner point â The point where two straight lines meet at an angle is called a straight corner point and do not have any control handles.