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【单选题】
设有一个半径为R的球面，球面的左侧是空气，球面右侧是玻璃长圆柱（n= 1.5），过球面顶点O和曲率中心C的连线是主光轴．设曲率半径R是12 cm ，在主光轴上距O点为 15 cm的左侧有一支小小的（如图）．则下述判断中正确的是【图片】
A.
在玻璃中呈一倒立的缩小的实像．
B.
在玻璃中呈一倒立的放大的实像．
C.
在空气中呈一正立的放大的虚像．
D.
在空气中呈一倒立的放大的虚像．
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