Concept explainers
Videos
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?
Why would you expect a spectacle lens of about 16D to be prescribed?
Answer to Problem 1CQ
The power lens, in normal conditions, is between 50.0 D and 54.0 D, therefore, a prescription of 16.0 D for a spectacle lens is insufficient to correct the sight of a person whose lens has been removed.
Introduction:
Cataract is an anomaly that occurs in the eye, specifically in the lens's eye. This disease consists in the deterioration of the quality of the image produced by a total or partial opacity of the eye lens, causing the light to scatter inside the eye and not be able to focus on the retina.
Explanation:
If a person's lens is removed and a spectacle lens with a prescribed power of 16D is fitted in place, the patient's vision would be evenly blurred. In other words, a power lens of 16D would be insufficient to correct the patient's view knowing that in normal conditions the range of the power lens is between 50.0D (distant vision) and 54.0D (close vision)
Conclusion:
The power lens, in normal conditions, is between 50.0 D and 54.0 D, therefore, a prescription of 16.0 D for a spectacle lens is insufficient to correct the sight of a person whose lens has been removed.
Explanation of Solution
Introduction:
Cataract is an anomaly that occurs in the eye, specifically in the lens's eye. This disease consists in the deterioration of the quality of the image produced by a total or partial opacity of the eye lens, causing the light to scatter inside the eye and not be able to focus on the retina.
If a person's lens is removed and a spectacle lens with a prescribed power of 16D is fitted in place, the patient's vision would be evenly blurred. In other words, a power lens of 16D would be insufficient to correct the patient's view knowing that in normal conditions the range of the power lens is between 50.0D (distant vision) and 54.0D (close vision)
Conclusion:
The power lens, in normal conditions, is between 50.0 D and 54.0 D, therefore, a prescription of 16.0 D for a spectacle lens is insufficient to correct the sight of a person whose lens has been removed.
Want to see more full solutions like this?
Chapter 26 Solutions
College Physics
Additional Science Textbook Solutions
Campbell Essential Biology (7th Edition)
Concepts of Genetics (12th Edition)
Genetic Analysis: An Integrated Approach (3rd Edition)
Biological Science (6th Edition)
Campbell Essential Biology with Physiology (5th Edition)
Biology: Life on Earth (11th Edition)
- 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?arrow_forwardA lamp of height S cm is placed 40 cm in front of a converging lens of focal length 20 cm. There is a plane mirror 15 cm behind the lens. Where would you find the image when you look in the mirror?arrow_forwardUnder what circumstances will an image be located at the focal point of a spherical lens or mirror?arrow_forward
- What will be the formula for the angular magnification of a convex lens of focal length f if the eye is very close to the lens and the near point is located a distance D from the eye?arrow_forwardAu object of height 3.0 cm is placed at 25 cm in front of a diverging lens of focal length 20 cm. Behind the diverging lens, there is a converging lens of focal length 20 cm. The distance between the lenses is 5.0 cm. Fluid the location and size of the final image.arrow_forwardWhat will be the angular magnification of a convex lens with the focal length 2.5 cm?arrow_forward
- 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?arrow_forwardAn object of height 3 cm is placed at 25 cm in front of a converging lens of focal length 20 cm. Behind the lens there is a concave mirror of focal length 20 cm. The distance between the lens and the mirror is 5 cm. Find the location, orientation and size of the final image.arrow_forwardAn object of height 3 cm is placed at a distance of 25 cm in front of a converging lens of focal length 20 cm, to be referred to as the first lens. Behind the lens there is another converging lens of focal length 20 cm placed 10 cm from the first lens. There is a concave mirror of focal length 15 cm placed 50 cm from the second lens. Find the location, orientation, and size of the final image.arrow_forward
- 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?arrow_forwardA converging lens made of crown glass has a focal length of 15.0 cm when used in air. If the lens is immersed in water, what is its focal length? (a) negative (b) less than 15.0 cm (c) equal to 15.0 cm (d) greater than 15.0 cm (e) none of those answersarrow_forwardA nearsighted man cannot see objects clearly beyond 20 cm from his eyes. How close must he stand to a mirror in order to see what he is doing when he shaves?arrow_forward
College PhysicsPhysicsISBN:9781938168000Author:Paul Peter Urone, Roger HinrichsPublisher:OpenStax College
University Physics Volume 3PhysicsISBN:9781938168185Author:William Moebs, Jeff SannyPublisher:OpenStax
Physics for Scientists and EngineersPhysicsISBN:9781337553278Author:Raymond A. Serway, John W. JewettPublisher:Cengage Learning
Physics for Scientists and Engineers with Modern ...PhysicsISBN:9781337553292Author:Raymond A. Serway, John W. JewettPublisher:Cengage Learning
Principles of Physics: A Calculus-Based TextPhysicsISBN:9781133104261Author:Raymond A. Serway, John W. JewettPublisher:Cengage Learning
Physics for Scientists and Engineers, Technology ...PhysicsISBN:9781305116399Author:Raymond A. Serway, John W. JewettPublisher:Cengage Learning