[单选题]
A spherical mirror on which reflection takes place on the 2lp9je f8 ofex+q (6vcinnvy716o5l o lshvcj/r ne z11:eer surface of the sphere is refe56seh 7vnj11 l :1olzvoeryc/ rred to as a
A. convex mirror.
B. concave mirror.
C. plane mirror.
D. double-sided mirror.
