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A thin convex lens has a power of $P = +2.0 \text{ D}$. What is its focal length $f$ in meters?
- A.$0.25 \text{ m}$
- B.$0.40 \text{ m}$
- C.$0.50 \text{ m}$
- D.$2.0 \text{ m}$
Show correct answer & step-by-step solution
Correct answer: C — $0.50 \text{ m}$
Solution
The power of a lens is given by where is in meters. Therefore, .
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