Question

30.
Half of a thin convex lens of focal length f and a plane mirror are in
contact as shown. A point object is placed at point O. The real image
and virtual image of the object coincide. The distance of the object from
the plane mirror is
(A) a
(B) 2f
(C) f
(D) data insufficient

Answer 1

Answer:

I think c is the answer of the sum