Question. Two identical glass (mg = 3/2) equiconvex lenses o f focal length feach are kept in contact. The space between the two lenses is filled with water (mw = 4/3). The focal length o f the combination is(a) f/3 D (b) f (c)4f/3(d)3f/4 相关知识点: 试题来源: ...