Two lab partners, Mary and Paul, are both farsighted. Mary has a near point of 6.8 cm from her...


Two lab partners, Mary and Paul, are both farsighted. Mary has a near point of 68 cm from her eyes and Paul has a near point of 114 cm from his eyes. Both students wear glasses that correct their vision to a normal near point of 25.0 cm from their eyes, and both wear glasses 1.80 cm from their eyes. In the process of wrapping up their lab work and leaving for their next class, they exchange glasses (Mary leaves with Paul's glasses and Paul leaves with Mary's glasses). When they get to their next class, find the following.

(a) Determine the closest object that Mary can see clearly (relative to her eyes) while wearing Paul's glasses. ....m

(b) Determine the closest object that Paul can see clearly (relative to his eyes) while wearing Mary's glasses. ....m

The shift in the Near-point:

The convex lens is used for the correction of the farsightedness eye defect. the convex lens is also known as the converging lens and the near point of a farsightedness person is the maximum limit of the distance of vision below which the affected person is not able to view objects clearly.

Answer and Explanation:

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Focal length of Mary Glasses

The given information is,

{eq}d = 1.80\;\mathrm{cm}\;(\textrm{distance of eye from the glass lens})\\ i =...

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Learn more about this topic:

Refractive Disorders of the Eye: Vocabulary


Chapter 20 / Lesson 12

Are you nearsighted? Farsighted? Neither? All three conditions actually have really weird technical terms. This lesson goes over them as we take a look at refractive disorders.

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