A lens has a power of +4 D. Its focal length is
Options
- A. 4 m
- B. 0.25 m
- C. -0.25 m
- D. 0.4 m
- E. None of the above
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Correct Answer (Detailed Explanation is Below)
B. 0.25 m
Detailed Explanation
Using P = 1/f, f = 1/4 = 0.25 m = 25 cm. Positive power indicates a convex lens.Share On
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BPSC TRE 4 General Science practice set 1