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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 Figure. Line AB is optical axis. Which of the following statement is`//`are correct?

A

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

B

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`.

C

Position of principal focus of mirror cannot be found.

D

`I` is real image.

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