Question

a lens has power 4D .Find the focal length that lens??​

Answer 1

Explanation:

P = 1/f

P = 1/f4 = 1/f

P = 1/f4 = 1/ff = 1/4

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Answer 2

Answer:

F= 0.25

Explanation:

Power = 1/Focal length (F)

F=1/4=0.25m