A convex lens has a focal length of 20 cm. Its power is
Options
- A. +2 D
- B. +4 D
- C. +5 D
- D. -5 D
- E. None of the above
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Correct Answer (Detailed Explanation is Below)
C. +5 D
Detailed Explanation
For f = 20 cm = 0.20 m, P = 1/0.20 = +5 D.
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