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26 Feb 2020

Which of the following statements are true concerning the eye?

  1. Farsightedness can be corrected with a diverging lens.

  2. Astigmatism refers to a defect in which the surface of the cornea is not spherical. Instead, it is more sharply curved in one plane than another.

  3. The far point of the normal eye is infinity.

  4. The hyperopic eye focuses rays from an object at infinity in front of the retina; the myopic eye focuses rays from an object at infinity behind the retina.

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Jarrod Robel
Jarrod RobelLv2
26 Feb 2020
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Related textbook solutions

Physics: Principles with Applications
7th Edition, 2013
Giancoli
ISBN: 9780321625922

Related questions

The cornea of the eye has a radius of curvature of approximately0.500 cm, and the aqueous humor behind it has an index ofrefraction of 1.35. The thickness of the cornea itself is smallenough that we shall neglect it. The depth of a typical human eyeis around 2.41 cm.

A)What would have to be the radius of curvature of the cornea sothat it alone would focus the image of a distant mountain on theretina, which is at the back of the eye opposite the cornea? (Note:The eye is acting like a spherical surface not a thin lens.) R = ?cm

B)If the cornea focused the mountain correctly on the retina asdescribed in part A, where would it focus the text from a computerscreen if that screen were 26.6 in front of the eye? i = ? cm

C)Given that the cornea has a radius of curvature of about 0.450 ,where does it actually focus the mountain? i = ? cm

A person with normal vision can focus on objects as close asafew centimeters from the eye up to objects infinitely faraway.There exist, however, certain conditions under which the rangeofvision is not so extended. For example, anearsightedperson cannot focus on objects farther than acertain point (thefar point), while a farsighted personcannot focus onobjects closer than a certain point (the nearpoint). Note thateven though the presence of a near point is commonto everyone, afarsighted person has a near point that is muchfarther from theeye than the near point of a person with normalvision.

Both nearsightedness and farsightedness can be correctedwiththe use of glasses or contact lenses. In this case, theeyeconverges the light coming from the image formed by thecorrectivelens rather than from the object itself.
When glasses (or contact lenses) are used tocorrectnearsightedness, where should the corrective lens form animage ofan object located at infinity in order for the eye to forma clearimage of that object?
The lens should form the image at thenearpoint.
The lens should form the image at thefarpoint.
The lens should form the image at a pointcloserto the eye than the near point.
The lens should form the image at apointfarther from the eye than the far point.
When glasses (or contact lenses) are usedtocorrect farsightedness, where should the corrective lens formanimage of an object located between the eye and the near pointinorder for the eye to form a clear image of that object?
The lens should form the image at thenearpoint.
The lens should form the image at thefarpoint.
The lens should form the image at a pointcloserto the eye than the near point.
The lens should form the image at apointfarther from the eye than the far point.

Background information
A person with normal vision can focus on objects as close as a fewcentimeters from the eye up to objects infinitely far away. Thereexist, however, certain conditions under which the range of visionis not so extended. For example, a nearsighted person cannot focuson objects farther than a certain point (the far point), while afarsighted person cannot focus on objects closer than a certainpoint (the near point). Note that even though the presence of anear point is common to everyone, a farsighted person has a nearpoint that is much farther from the eye than the near point of aperson with normal vision.

Both nearsightedness and farsightedness can be corrected with theuse of glasses or contact lenses. In this case, the eye convergesthe light coming from the image formed by the corrective lensrather than from the object itself.

Part A
When glasses (or contact lenses) are used to correctnearsightedness, where should the corrective lens form an image ofan object located at infinity in order for the eye to form a clearimage of that object?

The lens should form the image at the far point.


Correct
PArt B If a nearsighted person has a far point df thatis 3.50 m from the eye, what is the focal length f1 thecontact lenses that the person would need to see an object atinfinity clearly?

f1 = ? m

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