Without glasses, your Uncle Albert can see things clearly only if they are between 30 cm and 140 cm from his eyes. Part A What power eyeglass lens will correct your uncle's myopia? Assume the lenses will sit 2.0 cm from his eyes. Express your answer using two significant figures. refractive power = -0.72 diopters Submit Previous Answers Part B Correct What is your uncle's near point when wearing these glasses? Express your answer using two significant figures. do = 35 ΜΕ ΑΣΦ Submit Previous Answers Request Answer × Incorrect; Try Again; 5 attempts remaining ? cm

Without glasses, your Uncle Albert can see things clearly only if they are between 30 cm and 140 cm from his eyes. Part A What power eyeglass lens will correct your uncle's myopia? Assume the lenses will sit 2.0 cm from his eyes. Express your answer using two significant figures. refractive power = -0.72 diopters Submit Previous Answers Part B Correct What is your uncle's near point when wearing these glasses? Express your answer using two significant figures. do = 35 ΜΕ ΑΣΦ Submit Previous Answers Request Answer × Incorrect; Try Again; 5 attempts remaining ? cm

University Physics Volume 3

17th Edition

ISBN:9781938168185

Author:William Moebs, Jeff Sanny

Publisher:William Moebs, Jeff Sanny

Chapter2: Geometric Optics And Image Formation

Section: Chapter Questions

Problem 105P: A 7.5 binocular produces an angular magnification of —7.50, acting like a telescope. (Mirrors are...

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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?
The normal power for distant vision is 50.0 D. A young woman with normal distant vision has a 10.0% ability to accommodate (that is, increase) the power of her eyes. What is the closest object she can see clearly?
A person with presbyopia has lost some or all of the ability to accommodate the power of the eye. If such a person’s distant vision is corrected with LASIK, will she still need reading glasses? Explain.
The accommodation limits for a nearsighted persons eyes are 18.0 cm and 80.0 cm. When he wears his glasses, he can see faraway objects clearly. At what minimum distance is he able to see objects clearly?
A particular patients eyes are unable to focus on objects closer than 35.0 cm and corrective lenses are to be prescribed so that the patient can focus on objects 20.0 cm from their eyes. (a) Is the patient nearsighted or farsighted? (b) If contact lenses are to lie prescribed, determine the required lens power. (c) If eyeglasses are to be prescribed instead and the distance between the eyes and the lenses is 2.00 cm, determine the power of the required corrective lenses. (d) Are the required lenses converging or diverging?
It has become common to replace the cataractclouded 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?
In Figures CQ36.11a and CQ36.11b, which glasses correct nearsightedness and which correct farsightedness?
Show that the magnification of a thin lens is given by M = di/do (Eq. 38.6). Hint: Follow the derivation of the lens makers equation (page 1233) and start with a thick lens.
. (a) In a camera equipped with a 50-mm focal-length lens, the maximum distance that the lens can be from the film is 60 mm. What is the smallest distance an object can be from the camera if its image on the film is to be in focus? What is the magnification? (b) An extension tube is added between the lens and the camera body so that the lens can be positioned 100 mm from film. How close can the object be now? What is the magnification?
A 7.5x binocular produces an angular magnification of 7.50, acting like a telescope. (Mirrors are used to make the image upright.) If the binoculars have objective lenses with a 75.0 cm focal length, what is the focal length of the eyepiece lenses?
If the lens of a person’s eye is removed because of cataracts (as has been done since ancient times), why would you expect a spectacle lens of about 16 D to be prescribed?
What is the magnification of a magnifying lens with a focal length of 10 cm if it is held 3.0 cm from the eye and the object is 12 cm from the eye?