Question

18. The power of a lens of focal length 20 cm in diopter is: (a) 0.25 D (b) 2.0D (c) 5.0 D (d) 0.05 D.
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Answer 1

Answer:

(c) 5.0 D.

Explanation:

p = 1/f=1/20=100/20=5 diopter.

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