A woman can read the large print in a newspaper only when it is at a distance of

Question

A woman can read the large print in a newspaper only when it is at a distance of 65 cm or more from her eyes. Is she nearsighted (myopic) or farsighted (hyperopic)? What kind of lens is used in her glasses to correct her eyesight? What should be the refractive power (in diopters) of her glasses (worn 1.7 cm from the eyes), so she can read the newspaper at a distance of 25 cm from the eyes? A person using a magnifying glass as in the figure observes that for clear vision its maximum angular magnification is 1.25 times as large as its minimum angular magnification. Assuming that the person has a near point located 22 cm from her eye, what is the focal length of the magnifying glass?

Explanation / Answer

According to the question provided we need to find the following parts.

As women is able to see a distance of 67 cm or more from her eyes.

so,she has difficulty reading close objects.

So she is farsighted (hyperopic) ====================================part a)

To correct her eyesight converging lens or convex lens will be used.===========part b)

u = 25 cm -1.7 cm = 23.3 cm

v = -65+1.7= -63.3cm

1/v+1/u =1/f

1/f =0.0271206

f=36.87225 cm

Power = 100/f = +2.71206 ========================part c)

Related Questions

Navigate

• Browse (All)
• Browse A
• Subjects

---

---

Integrity-first tutoring: explanations and feedback only — we do not complete graded work. Learn more.