2.5 The Eye
Cornea and lens focusing onto the retina, accommodation and its limits, and the corrective optical power prescribed for myopia and hyperopia.
12 exercises
2.5 Exercise 2
When laser light is shone into a relaxed normal-vision eye to repair a tear by spot-welding the retina to the back of the eye, the rays entering the eye must be parallel. Why?
2.5 Exercise 4
It has become common to replace the cataract-clouded lens of the eye with an internal lens. This intraocular lens can be chosen so that the person has perfect distant vision. Will the person be able to read without glasses? If the person was nearsighted, is the power of the intraocular lens greater or less than the removed lens?
2.5 Exercise 6
Unless otherwise stated, the lens-to-retina distance is 2.00 cm.
What is the power of the eye when viewing an object 50.0 cm away?
2.5 Exercise 8
Unless otherwise stated, the lens-to-retina distance is 2.00 cm.
The print in many books averages 3.50 mm in height. How high is the image of the print on the retina when the book is held 30.0 cm from the eye?
2.5 Exercise 10
Unless otherwise stated, the lens-to-retina distance is 2.00 cm.
People who do very detailed work close up, such as jewelers, 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 image size of a 1.00-mm object, such as lettering inside a ring, held at th…
2.5 Exercise 12
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?
2.5 Exercise 14
Unless otherwise stated, the lens-to-retina distance is 2.00 cm.
The power for normal close vision is 54.0 D. In a vision-correction procedure, the power of a patient’s eye is increased by 3.00 D. Assuming that this produces normal close vision, what was the patient’s near point before the procedure?
2.5 Exercise 16
Unless otherwise stated, the lens-to-retina distance is 2.00 cm.
The power for normal distant vision is 50.0 D. A severely myopic patient has a far point of 5.00 cm. By how many diopters should the power of his eye be reduced in laser vision correction to obtain normal distant vision for him?
2.5 Exercise 18
Unless otherwise stated, the lens-to-retina distance is 2.00 cm.
The power of a physician’s eyes is 53.0 D while examining a patient. How far from her eyes is the object that is being examined?
2.5 Exercise 20
Unless otherwise stated, the lens-to-retina distance is 2.00 cm.
The far point of a myopic administrator is 50.0 cm. (a) What is the relaxed power of his eyes? (b) If he has the normal 8.00% ability to accommodate, what is the closest object he can see clearly?
2.5 Exercise 22
Unless otherwise stated, the lens-to-retina distance is 2.00 cm.
Repeat the previous problem for eyeglasses held 1.50 cm from the eyes.
2.5 Exercise 24
Unless otherwise stated, the lens-to-retina distance is 2.00 cm.
Repeat the previous problem for glasses that are 1.75 cm from the eyes.
Adapted from University Physics Volume 3 © 2016 Rice University. Licensed under CC BY 4.0. Source: University Physics Volume 3. Imported at revision db44eb9.