Power of a convex lens of focal length 50 cm:
A2 D
B0.5 D
C-2 D
D50 D
Answer & Solution
Correct answer: A. 2 D
Power P = 1/f (in metres). f = 50 cm = 0.5 m. P = 1/0.5 = 2 dioptre (D). Positive sign means converging lens.
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