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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

Unless otherwise stated, the lens-to-retina distance is 2.00 cm.

What is the near point of a person whose eyes have an accommodated power of 53.5 D?

Unless otherwise stated, the lens-to-retina distance is 2.00 cm.

People who do very detailed work close up, such as jewellers, often can see objects clearly at much closer distance than the normal 25 cm.

(a) What is the power of the eyes of a woman who can see an object clearly at a distance of only 8.00 cm?

(b) What is the size of an image of an 1.00 mm object, such as lettering inside a ring, held at this distance?

(c) What would the size of the image be if the object were held at the normal 25.0 cm distance?

Unless otherwise stated, the lens-to-retina distance is 2.00 cm.

What is the far point of a person whose eyes have a relaxed power of 50.5 D?

A student鈥檚 eyes, while reading the blackboard, have a power of 51.0 D. How far is the board from his eyes?

A boy has a near point of 50 cm and a far point of 500 cm. Will a 鈥�4.00 D lens correct his far point to infinity?
See all solutions

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