Question

power of a lens is found to be +2.5 diopter. ​

Answer 1

Explanation:

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Answer 2

Answer:

40 cm

Explanation:

Power(P) = 1/focal length (f)

P = 1/f

f = 1/P = 1/2.5 = 10/25 = 2/5 = 0.4m = 0.4×100 = 40cm