[单选题]
A spherical mirror on which reflecti)z)iddi1 oa +jzl8ko1on takes place on the inner surface of6 x*ih 2od 5vjgbj6un5 3nrx)s the sphere is referred to as a6n2 dgjxvn5ris* 3huob6 5)jx
A. convex mirror.
B. concave mirror.
C. plane mirror.
D. double-sided mirror.
