1. PHYS 221 Recitation Kevin Ralphs Week 10

2. Overview

3. Multiple Lenses/Mirrors General Method 1.Draw a picture showing the object of interest and the lenses/mirrors in the problem 2.Use the rules for ray tracing along with the thin-lens/mirror equation from Chapter 24 to find the location and magnification of the image produced by the first lens/mirror in the system 3.The image produced by the first lens/mirror then acts as the object for the second lens/mirror in the system. 4.Use ray tracing and the thin-lens/mirror equation a second time to find the image produced by the second lens/mirror in the system. Adapted from Giordano Textbook pg 910

4. Multiple Lenses/Mirrors Contact Lenses and Eye Glasses – A properly formed eye has a near point distance (the closest an object can be whilst in focus) equal to the 10 x the diameter of the eye, approximately 25 cm – Far-Sighted This occurs when the near point distance is farther from the eye than normal The corrective lens must then place near objects beyond the near point distance – Near-Sighted This occurs when the near point distance is much closer The corrective lens must then take far-away objects (those out at infinity) and place them within their ability to focus – The difference between glasses and contact lenses is that eye glasses have a distance between the two lenses

5. Refractive Power

6. Angular Magnification

7. Optical SystemAngular Magnification Magnifying Glass Compound Microscope Refracting Telescope Reflecting Telescope