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Chapter 26: Q22PE (page 956)

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

Short Answer

Expert verified

The child's near point is -0.308 m.

Step by step solution

01

How do contact lenses work?

Contact lenses operate by bending light to bring it into focus on the retina, where vision receptors collect data and send it to the brain.

02

Given information and Formula to be used

P= 0.750 D

You know that the near point for a normal relaxed eye is 0.25 m.

The power of the lens is equal to the reciprocal of the focal length is :

P=1fP=1d0+1d1

03

What is the child's near point?

Rearrange the distance between the close point and the child's eyes and solve for it:

Equation (1) is obtained by substituting data values.

1d0=P-1did0=P-1di=10.750D-10.25md0=-0.308mTherefore,accordingtotheresult,thechild'snearpointis-0.308m.

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Most popular questions from this chapter

The image produced by the microscope in figure below cannot be projected. Could extra lenses or mirrors project it? Explain.

A person with presbyopia has lost some or all of the ability to accommodate the power of the eye. If such a person鈥檚 distant vision is corrected with LASIK, will she still need reading glasses? Explain.

How does the power of a dry contact lens compare with its power when resting on the tear layer of the eye? Explain.

A very myopic man has a far point of 20.0 cm. What power contact lens (when on the eye) will correct his distant vision?

Consider a telescope of the type used by Galileo, having a convex objective and a concave eyepiece as illustrated in Figure 26.23(a). Construct a problem in which you calculate the location and size of the image produced. Among the things to be considered are the focal lengths of the lenses and their relative placements as well as the size and location of the object. Verify that the angular magnification is greater than one. That is, the angle subtended at the eye by the image is greater than the angle subtended by the object.
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