Person B can focus on objects ranging from 68cm lo infinity. Is this person near

Question

Person B can focus on objects ranging from 68cm lo infinity. Is this person near-sighted or far-sighted? What strength glasses would you prescribe (keeping in mind that prescription strength is usually specified to an accuracy of plusminus 0.25D)? A person tells you their eyeglass strength is -5D (diopters). Is the person near-sighted or far-sighted, and what is their near and far point? Find a person (e.g. friend, roommate, self) who uses prescription glasses or contact lenses and who, ideally, is willing to look up their prescription strength for you. Without their glasses/contact lenses, what is their approximate near and far point Based on this distance estimate, what strength glasses would you recommend? Does this value match the actual strength of their prescription?

Explanation / Answer

1) far sight . he has to use1.5 D glass ....... 2) near sight .... near and far points are (-4.166, 0.25) m

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