Q: The focal length of a concave lens is 0.5 m. The power of the lens is
(a)+0.5 D
(b)-0.5 D
(c)+2.0 D
(d)-2.0 D
Correct Answer: (d)
The correct answer is (d): −2.0 D. Subject: General Studies | Sub-topic: Miscellaneous Note: This answer was determined through AI-based research. Verify against the official answer key when available.