Question

(a) If a person wears lens of power – 6D for distant vision and for correcting his near vision he needs a lens of +2D. Determine the focal length of the lenses in both the case.

Answer 1

Power = 100f so, (1) -0.6=100f f=-1.6 m that is convex lens (2) 2 =100f f=12 m that is concave lens

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