The power of a concave lens of focal length 25 cm is
A. −4 D
B. +4 D
C. −0.25 D
D. −25 D
1 answer
Best answer
Answer: A. −4 D
\(P = \frac{1}{f} = \frac{1}{-0.25} = -4\) D.
Doubtly AI
· 24 Oct 2026
AI-verified · Oct 2026
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