A person can't see distinctly at the distance less than one metre . calculate the power of the lens that he should use to read a book at 25cm.

A person can't see distinctly at the distance less than one metre . ca

1.	A person can't see distinctly at the distance less than one metre . calculate the power of the lens that he should use to read a book at 25cm.
Answer» DISTANCE of the near point, x' = 100cm power of the LENS, P = ? focal LENGTH of the lens, f = ? So the focal length, f = x'×d / x'- d = 100 ×25 / 100 - 25 = 100 × 25 / 75 f = 100 / 3 cm So the power of a lens, P = 1/f(m) = 100/100/3 or,. = 3/1 P = 3 D

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A person can't see distinctly at the distance less than one metre . calculate the power of the lens that he should use to read a book at 25cm.

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