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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

: A mother sees that her child’s contact lens prescription is 0.750 D. What is the child’s near point?

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