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PHYS 131 Lecture Notes - Lecture 13: Dioptre, Virtual Image, Thin Lens

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School
Towson University
Department
Physics
Course
PHYS 131
Professor
Sean Lally

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Document Summary

For seeing at a distance, the eye muscles are relaxed. The far point of a normal eye is infinity. If an object is at infinity (or very far away) then its rays run parallel and the image is located at the focal point. Since the image must also lie on the retina, the focal point of a normal, relaxed eye lies on the retina. The focal length of the human eye focused at infinity is the same as the distance from cornea to retina. Eye lens is thin for viewing distant objects: focal point is on the retina via the cornea only. Eye lens has a power of zero diopters! Eye lens becomes thicker (bulgy) for seeing close objects: focal length is shortened. Accommodation- the ability of the eye to adjust its focal length. For normal vision the far point is infinity. The cornea provides an image on the retina without the help of the eye lens.

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Related textbook solutions

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

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Related Questions

A certain child's near point is 10.0 cm; her far point (with eyes relaxed) is 125 cm. Each eye lens is 2.00 cm from the retina. (a) Between what limits, measured in diopters, does the power of this lens-cornea combination vary? (b) Calculate the power of the eyeglass lens the child should use for relaxed distance vision. Is the lens converging or diverging? 

A certain child’s near point is 10.0 cm; her far point (with eyes relaxed) is 125 cm. Each eye lens is 2.00 cm from the retina. (a) Between what limits, measured in diopters, does the power of this lens–cornea combination vary? (b) Calculate the power of the eyeglass lens the child should use for relaxed distance vision. Is the lens converging or diverging?

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.