A luminous point object is placed at O, whose image formed at I as shown in figure. Line AB is the optical axis. Which of the following statement is/are correct?
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a
If a lens is used to obtain the image, then it must be a converging lens and its optical center will be the intersection point of line AB and OI
b
If a lens is used to obtain the image, then it must be a diverging lens and its optical center will be the intersection point of line AB and OI
c
If a mirror is used to obtain the image, then the mirror must be concave and the object and image subtend equal angles at the pole of the mirror