The power of a lens is + 2.0 D. Its focal length should be :; A. 100 cm; B. 50 cm; C. 25 cm; D. 40 cm
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Answer:
The power of a lens is +2.0D. It's focal length should be is A.100
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Answer:
50 cm
Explanation:
Power of a lens is equal to the reciprocal of the focal length in metres.
P = 1/f
- Therefore f = 1/P
- f = 1/ 2
- f = 0.5 metres
- or f = 50 cm.
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