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. -2.0 D
Explanation
The power of a lens is \( P = \frac{1}{f} \). For a concave lens, focal length is negative (\( f = -0.5 \) m), hence \( P = -2.0 \) D.
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