MCQ

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

• A
  Device $'X\ '$ is a concave mirror of radius of curvature $12\ cm.$
• B
  Device $'X\ '$ is a concave mirror of focal length $6\ cm.$
• ✓
  Device $'X\ '$ is a concave mirror of focal length $12\ cm.$
• D
  Device $'X\ ' $is a convex mirror of focal length $12\ cm.$