Question

The power of a lens is 4D, then the focal length of that lens is?​

Answer 1

Answer:

f = 25 cm

Explanation:

P = 1 / f where P is power and f is focal length.

4 = 1 / f

f = 1 / 4

f = 0.25 m

f = 25 cm

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Answer 2

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p(power) = 1/focal length (in metres)

4 =1/f

answer is f=1/4 m

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