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another lens problem from my tutor


Full Member
10+ Year Member
Aug 20, 2008
  1. Pre-Medical
Optometrists use a linear scale of lens power, measured in diopters, to prescribe corrective lenses. Lens power is given by the equation P = 1/f, where f is the lens focal length in meters. Sufferers of myopia, or nearsightedness, have dificult resolving distant objects because the lenses in their eyes are too strong. If a myopic person has a prescription of -5 diopters, what image do her corrective lenses create for distant objects?

A. an upright, real image about 20cm in front of her eyes
B. an uprght, virtual image about 20cm in front of her eyes
C. an inverted, real image about 20cm behind her eyes
D. an inverted, virtual image 5 m behind her eyes


Full Member
10+ Year Member
5+ Year Member
Apr 27, 2008
  1. Pre-Medical
Myopia or nearsightedness =diverging lenses, farsightedness or hyperopia=converging lenses. Diverg. lenses always make negative virtual upright images, like convex mirrors. Only virtual upright image is answer B. I don't think calculations needed just def. of lenses.
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