A) briefly explain the following terms: i. spherical aberration. ii. coma. astigmatism. iv distortion, 121 iii curvature of field, chromatic aberration, n. vi b) state the types of distortion known. c) explain in details (with the aid of diagram where necessary) how distortion images 21 comes about in 16

According to social exchange theory, altruistic behaviors benefit the individual who performs them.

Figure 9 on page 362 shows various motions of balls. the curved path followed by the yellow ball in b in picture b is result of a) inertia b) centripetal motion c) gravity and horizontal velocity d) linear motion

Boxing gloves are padded to lessen the force of a blow. (a) calculate the force exerted by a boxing glove on an opponent’s face, if the glove and face compress 7.50 cm during a blow in which the 7.00-kg arm and glove are brought to rest from an initial speed of 10.0 m/s. (b) calculate the force exerted by an identical blow in the gory old days when no gloves were used and the knuckles and face would compress only 2.00 cm. (c) discuss the magnitude of the force with glove on. does it seem high enough to cause damage even though it is lower than the force with no glove?