A lens has a power of -2 D. Which type of lens is it and what is its focal length?
Options
- A. Convex lens, +50 cm
- B. Concave lens, -50 cm
- C. Convex lens, -50 cm
- D. Concave lens, +50 cm
- E. None of the above
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Correct Answer (Detailed Explanation is Below)
B. Concave lens, -50 cm
Detailed Explanation
Negative power indicates a concave lens. f = 1/P = 1/(-2) = -0.5 m = -50 cm.Share On
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BPSC TRE 4 General Science practice set 1