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Chapter 26: Q18PE (page 956)

A myopic person sees that her contact lens prescription is –4.00 D. What is her far point?

Short Answer

Expert verified

The far point of the person is at 25.0 cm.

Step by step solution

01

Step 1:The myopic view

Myopia is a vision condition in which visual pictures focus in front of the retina of the eye, creating vision problems of distant objects.

02

Given information and Formula to be used

The power of contact lens prescription for a myopic person is P = -4.00 D

The power needed P to correct the vision can be obtained using the expression,

  1. P=1d0+1di…………………..(1)
03

What is her far point?

Rearrange the equation (1) to solve for the distance between the far point and the person's eyes as follows,

1d0=P-1di=50D-4.00D-10.02m=-4.00D1m-11D=-4.00m-1

This gives,

d0=1-4.00m-1100cm1m=-25.0cm

Therefore, the far point is at 25.0 cm.

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Most popular questions from this chapter

Repeat the previous problem for eyeglasses held 1.50 cm from the eyes.

How does the NA of a microscope compare with the NA of an optical fiber?

A microscope with an overall magnification of 800 has an objective that magnifies by 200.

(a) What is the magnification of the eyepiece?

(b) If there are two other objectives that can be used, having magnifications of 100 and 400, what other total magnifications are possible?

The contact lens prescription for a mildly farsighted person is 0.750 D, and the person has a near point of 29.0 cm. What is the power of the tear layer between the cornea and the lens if the correction is ideal, taking the tear layer into account?

If the lens of a person’s eye is removed because of cataracts (as has been done since ancient times), why would you expect a spectacle lens of about \({\rm{16 D}}\) to be prescribed?
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