A luminous point object is placed at \( O \), whose image is formed at \( I \) as shown in figur...

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