A luminous point object is placed at O, ...

A luminous point object is placed at `O`, whose image is formed at `I` as shown in the figure. `AB` is the optic axis. Which of the following statements are correct ?

If a lens is used to obtain image, the lens must be converging.

If a mirror is used to obtain image, the mirror must be a convex mirror having pole at the point of intersection of lines `OI` and `AB`.

Position of principal focus of mirror cannot be found.

`I` is real image.

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