# ch24notes - Chapter 24 Notes College Physics by...

• Notes
• 2

This preview shows pages 1–2. Sign up to view the full content.

Chapter 24 Notes College Physics by Giambattista et al. John B. Ross, Ph.D. IUPUI Physics Dept. Lenses in Combination 1) The image of the 1 st lens (“objective”) is the object of the 2 nd lens (“eyepiece”). 2) m total = m 1 ·m 2 The Human Eye retina ciliary muscles Image formed at back of retina cornea (about 2.5 cm behind lens) lens optic nerve Cornea – responsible for large bending of light, “coarse adjustment” Lens – focuses ( accommodates ) close and distant objects, “fine adjustment” Ciliary muscles – change the focal length (curvature) of the lens to accommodate close objects. Greater muscle power for closer objects. f must be adjusted to accommodate different object distances since the image distance is fixed (2.5 cm.) Near Point ( NP ) – closest point that may be seen in focus (normal = 25 cm). Far Point ( FP ) – farthest point that may be seen in focus (normal =

This preview has intentionally blurred sections. Sign up to view the full version.

This is the end of the preview. Sign up to access the rest of the document.

Unformatted text preview: ∞). “Prescription Principle:” Corrective lenses create images of objects outside of the range of clear sight and place those images within the range of clear sight. Refractive Power meters in f P 1 unit: diopters (D) Nearsightedness (Myopia) : Far Point < ∞ Eyeball too long treat as if lens is too powerful, so use concave lens to correct. Prescription: f = – FP Chapter 24 Notes College Physics by Giambattista et al. John B. Ross, Ph.D. IUPUI Physics Dept. Farsightedness (Hyperopia/Presbyopia) : Near Point > 25 cm (Hyperopia) Eyeball too short treat as if lens is too weak, so use convex lens to correct. (Presbyopia) ciliary muscles too weak to accommodate close objects. f NP cm 1 1 25 1 Prescription: 25 25 NP NP f...
View Full Document

• Spring '10
• Physics, Corrective lens, Presbyopia, Dioptre, IUPUI Physics Dept

{[ snackBarMessage ]}

### What students are saying

• As a current student on this bumpy collegiate pathway, I stumbled upon Course Hero, where I can find study resources for nearly all my courses, get online help from tutors 24/7, and even share my old projects, papers, and lecture notes with other students.

Kiran Temple University Fox School of Business ‘17, Course Hero Intern

• I cannot even describe how much Course Hero helped me this summer. It’s truly become something I can always rely on and help me. In the end, I was not only able to survive summer classes, but I was able to thrive thanks to Course Hero.

Dana University of Pennsylvania ‘17, Course Hero Intern

• The ability to access any university’s resources through Course Hero proved invaluable in my case. I was behind on Tulane coursework and actually used UCLA’s materials to help me move forward and get everything together on time.

Jill Tulane University ‘16, Course Hero Intern