A girl with hyperopia has an abnormal near point of 60.0 cm. Assuming that the normal near point for a human is 25.0 cm, what power lens is required to correct her vision? Neglect the distance between the eye and the corrective lens. a. +1.66 D b. +1.24 D C. +1.45 D d. +2.33 D e. +1.98 D

A girl with hyperopia has an abnormal near point of 60.0 cm. Assuming that the normal near point for a human is 25.0 cm, what power lens is required to correct her vision? Neglect the distance between the eye and the corrective lens. a. +1.66 D b. +1.24 D C. +1.45 D d. +2.33 D e. +1.98 D

College Physics

11th Edition

ISBN:9781305952300

Author:Raymond A. Serway, Chris Vuille

Publisher:Raymond A. Serway, Chris Vuille

Chapter1: Units, Trigonometry. And Vectors

Section: Chapter Questions

Problem 1CQ: Estimate the order of magnitude of the length, in meters, of each of the following; (a) a mouse, (b)...

See similar textbooks

Similar questions

A person is having farsightedness vision defect because, О а. the eye become too short O b. the eye become too long О . the lens of the eye become too strong O d. no vision
A biologist changes the objective lens of a microscope, replacing a 20× objective with a 10× objective. To keep the magnification the same, the focal length of the eyepiece mustA. Be doubled.B. Be halved.C. Remain the same.D. The magnification cannot stay the same if the objective power is changed.
A boy with myopia has an abnormal far point of 80.0 cm. What power of corrective lens is needed to accurately adjust his vision? Neglect the distance between the eye and the corrective lens. a. -2.00 D b. -1.25 D C. -1.75 D d. -1.50 D e. -2.25 D
7. A 1.50 cm-high object is placed 18.5 cm to the left of a converging lens of focal length 38.75 cm. A diverging lens of focal length -80.0 cm is 30.0 cm to the right of the converging lens. Draw the appropriate ray diagram on the figure below, and find (a) the position, and (b) the height of the final image, as well as (c) the overall magnification of the optical system. f₂ P₁ ITI Object f₁ F₁ d f₁ F₁
What is the power of a lens with 16cm focal length? A. 1.50D B. 2.00D C. 2.50D D. 3.00D What is the power of a lens with 16cm focal length? A. 0.20D B. 2.00D C. 2.50D D. 6.30D What is the power of a lens with 20 inches focal length? A. 0.20D B. 2.00D C. 2.50D D. 6.30D
10.
5. Consider the sphere of radius 409 mm of refractive index 1.6 in air. (a) Find the effective focal length of the lens (b) Find the back focal length of the lens. (c) Find the position of the first and second principle planes using lens matrix. (d) Using paraxial ray tracing, find the exit height of a parallel ray for y = 50 mm and x = 70 mm. B.F.L = PP1 = PP2 = %3D
2. An object is placed 50.cm in front of a converging lens and then 15.5cm in front of a diverging lens. Both lenses have a focal length of 12.0cm. For both cases, find the image distance.
3. Figure 2.2 is a photograph of an eyeball with the image of a boy in a doorway. Is the eye here acting as a lens or as a mirror? Explain. 6. A stamp collector uses a converging lens with focal length 28 cm to view a stamp 16 cm in front of the lens. (a)Where is the image located? (b) What is the magnification? Figure 2.1 Problem 2 Figure 2.2 Problem 3
VARIANT 14 1. A clear glass light bulb is placed 1.5 m from a convex lens having a 45 cm focal length. Use ray tracing to get an approximate location for the image. Then use the thin lens equations to calculate (a) the location of the image and (b) its magnification. Verify that ray tracing and the thin lens equations produce consistent results. 2. When driving you need to be able to clearly see road signs and traffic some distance ahead of you as well as the dashboard in your car. Assume that you have a normal lens-to-retina distance. (a) What minimum optical power of the eye is needed to clearly see a road sign 150 m ahead? (b) What maximum optical power is needed to clearly see the dashboard 50 cm away? (c) What range of accommodation AF is needed? 3. Determine the speed of the electrons incident on the anode surface of the X-ray tube if the minimum wavelength of the emitted X-ray radiation was 5 nm. 4. A 5000-Ci 60Co source used for cancer therapy is considered too weak to be…
4. Assume selecting two Crown glasses with na = 1.52 and different Abbe numbers (va) to make following 4 lenses with the same focal length (f), but different lens shape factor (s). Which lens has the smallest spherical and chromatic aberrations? A. va = 81.8, s = 2. В. Va B. va = 81.8, s = 1. C. va = 66.8, s = 2. D. va = 66.8, s = 1. %3D %3D %3D
1-