A convex lens has a focal length of 20 cm. Its power is
Options
- A. +2 D
- B. +5 D
- C. -5 D
- D. -2 D
- E. None of the above
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Correct Answer (Detailed Explanation is Below)
B. +5 D
Detailed Explanation
Power P = 1/f in metre. f = 20 cm = 0.20 m, so P = 1/0.20 = +5 D.Share On
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BPSC TRE 4 General Science practice set 1