An object is placed at a distance of $18 \ cm$ in front of a mirror. If the image is formed at a distance of $4 \ cm$ on the other side,then the focal length,nature of the mirror,and nature of the image are respectively:
- A$3.14 \ cm$,concave mirror and real image
- B$3.14 \ cm$,convex mirror and real image
- C$5.14 \ cm$,convex mirror and virtual image
- D$5.14 \ cm$,concave mirror and virtual image
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