MCQ
Study the following diagram and select the correct statement about the device 'X':

- ADevice 'X' is a concave mirror of radius of curvature 12 cm.
- BDevice 'X' is a concave mirror of focal length 6 cm.
- ✓Device 'X' is a concave mirror of focal length 12 cm.
- DDevice 'X' is a convex mirror of focal length 12 cm.