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

Question

Person B can focus on objects ranging from 68cm to 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 ±0.25D)? lil pecifed to an curacyot a025ibe (keepingin mind tha 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? 3. 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 (note: it is sufficient to do this measurement and calculation for one eye only)? Based on this distance estimate, what strength glasses would you recommend? Does this value match the actual strength of their prescription?

Explanation / Answer

1) Person is near sighted .

strength of glasses = 1/(0.68)

                                 = + 1.47 D

2) Person is far sighted .

Thus, far point = (1/5) * 100

                        = 20 cm

near point = 25 cm

3)   Here, near point = 25 cm

      strength of glasses = - 2.5 D

Thus, far point = (1/2.5) * 100

                         = 40 cm

Thus, friend is suffering from far sightedness .

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