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.
What is the purpose of a focus group interview? Focus group research is used to develop or improve products or services. The main purpose is to provide data to enhance, change or create a product or service which targets a key customer group. The value of the information gathered is dependent on defined objectives and the preparation done prior to conducting the focus group interviews.