11:21 AM Fri Jun 4* 77% 4YYYc) When the muscles connected to the crystalline lens relax, the focal length is 9.0000 cm. With this focallength, how close must an object be to form sharply focused images on the retina? (Note: this distance iscalled the near point of vision.)d) As people age, the crystalline lens hardens (a condition called presbyopia or "old-age" eyes) and canonly vary in focal length from 12 to 15.60 cm. Calculate range of vision (the new near point and far point)for this older eye.e) Based on part d) why might an older person hold the newspaper at arm's length to read it?f) The iris of the eye serves two different purposes. First, the iris controls the total amount of light enteringthe eye so a person can see in varying light levels. Secondly, the iris blocks light from hitting the extremeedges of the crystalline lens. Why might an eye want to block the light hitting the extreme edges of alens? What is the name for the effect when light does hit the edges of a lens? Can you understand whya person's vision is blurred when they get their eyes dilated at the doctor?g) A person's eyes also dilate when they get drunk. What effect does this have on vision (not to mentionjudgment)?h) What is the pupil of the eye?i) Explain why the crystalline lens of the eye gets a virtual object from the cornea.>D The Human EyeVitreoushumorCiliarymuscleRetinaRetinalarteriesand veinsCorneaCrystallinelensPupil -AqueoushumorOpticIrisnerve© 2003 Thomson - Brooks Cole(a)The human eye can be approximated by a two-lens optical system. Light enters the eye and first travelsthrough the cornea and aqueous humor. The cornea and aqueous humor are sometimes called theaqueous lens. The aqueous lens of a sample eye has a focal length of 4.16666 cm. The iris blocks someof the light that travels through the aqueous lens. Next, light travels through the center of the crystallinelens and vitreous humor to the retina. The crystalline lens and the vitreous humor can be approximatedby one lens, called the crystalline lens, with a focal length that can change. For healthy eyes, thecrystalline lens is set 0.50000 cm behind the aqueous lens and can vary in focal length from 9.0000 cm to16.5000 cm. The retina acts as an image screen upon which real images are focused for processing bythe brain. The retina is 3.0000 cm behind the crystalline lens.a) Draw an optical diagram of the eye's lens system. Label the positions of the aqueous lens, thecrystalline lens and the retina.Iretinacrystaline tengb) When the muscles connected to the crystalline lens contract fully, its focăl length is 16.5000 cm. Withthis focal length, how far away must an object be to form sharply focused images on the retina? (Note:this distance is called the far point of vision.)

Human Eye -- Human eye behaves like a single lens with an adjustable focal length which forms an…

T c) When the muscles connected to the crystalline lens relax, the focal length is 9.0000 cm. With this focal length, how close must an object be to form sharply focused images on the retina? (Note: this distance is called the near point of vision.) d) As people age, the crystalline lens hardens (a condition called presbyopia or "old-age" eyes) and can only vary in focal length from 12 to 15.60 cm. Calculate range of vision (the new near point and far point) for this older eye.

T c) When the muscles connected to the crystalline lens relax, the focal length is 9.0000 cm. With this focal length, how close must an object be to form sharply focused images on the retina? (Note: this distance is called the near point of vision.) d) As people age, the crystalline lens hardens (a condition called presbyopia or "old-age" eyes) and can only vary in focal length from 12 to 15.60 cm. Calculate range of vision (the new near point and far point) for this older eye.

Biology 2e

2nd Edition

ISBN:9781947172517

Author:Matthew Douglas, Jung Choi, Mary Ann Clark

Publisher:Matthew Douglas, Jung Choi, Mary Ann Clark

Chapter36: Sensory Systems

Section: Chapter Questions

Problem 21RQ: Why is it easier to see images at night using peripheral, rather than the central, vision? Cones are...

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