17. The far-sighted eye accommodates, without straining, at a distance of at least d0 = 50 cm. What should be the optical power of the glasses in order for the accommodation limit to be reduced to d = 20 cm, if both the eye and glasses are considered to be close to each other with thin lenses.
Detailed solution. Decorated in Microsoft Word 2003. (Target decided to use formula editor)
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