Question

The power of a convex lens is + 4 diopters Therefore its focal length is....
(A) 0.5 m
B) 0.25 m
(C) 8 m
(D) 2 m.

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Answer 1

hi dear

your answer is

option b

Based on the above formula, the focal length of a lens, given its diopter, is calculated as follows: For example, if a lens has diopter +2, its focal length is 1000/2=500mm, and a lens of +4 diopter has focal length 1000/4 = 250mm.

hopes its helps you