[单选题]
A spherical mirror on whicr gb5v+ x,2neuh reflection takes place on the outer surow*4 qkfxzz, j0c-s-m46 xup rface of the spheric-kwr jsxfq,4zx 0mzcu4o -6*p al shape is referred to as a
A. convex mirror.
B. concave mirror.
C. plane mirror.
D. double-sided mirror.
