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23 Nov 2019

Remarks: The ability of a lens to magnify objects led to theinventions of reading glasses, microscopes, and telescopes.

Question: If the lens is used to form an image of the sun on ascreen, the lens should be located at a distance from the screenequal to:

* the radius of the surface of the lens.

* a value between the distance to the focal point and twice thedistance to the focal point.

* the sum of the radii of the two lens surfaces.

* twice the distance from the lens to its focal point.

* the distance from the lens to its focal point.

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Lelia Lubowitz
Lelia LubowitzLv2
20 Jul 2019

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Related textbook solutions

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

Related questions


1.A candle isplaced 2.5f in front of a converging lens. Where will the image ofthe candle appear? What kind of image is it? (select twoanswers)
(a) within f of the lens (j) image is real
(b) between f and 2f from the lens (k) image is virtual
(c) greater than 2f from the lens


2.A certain thin lens has a focal length f. If you halved both ofits radii of curvature, but change nothing else, its focal lengthwill now be (Show calculation)

(a) 4f

(b) 2f

(c) f

(d) f/2


3. The figure depicts a concave spherical mirror whose center ofcurvature is point C. Where should a point source of light (like atiny LED) be located if its reflected light is to emerge parallelto the central axis?


A.
B.
C.
D.
E.

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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