Whichstatementabouttheimageformedbyathinconverginglensiscorrect?AitisalwaysrealanderectBitisalwaysrealandinvertedCitisalwaysvirtualanderectDitmaybeeithervirtualorreal给出原因.（好像是分小于f,f与2f之

Question

Which statement about the image formed by a thin converging lens is correct?
A it is always real and erect
B it is always real and inverted
C it is always virtual and erect
D it may be either virtual or real
给出原因.（好像是分小于f,f与2f之间,大于2f三种情况,f是焦距）

Answer 1

物距（下略）小于f,正立放大虚象
f与2f之间,倒立放大实像
大于2f,倒立缩小实像
另外
等于f,不能成像
等于2f,倒立等大实像