Problem 20.2 A Two-Lens System compound lens system consists of two converging lenses, one at a = -20.0 cm with focal length f1 = +10.0 cm, and the other at A converging lens with a focal length of 20 cmn and a diverging lens with a focal length of -30 cm are 70.0 cm apart. A 2.5-cm-tall object is 40 cm in = +20.0 em with focal length f2 = +8.00 em. An object 1.00 centimeter tall is placed ont of the converging lens. Part A Calculate the image position relative to the diverging lens. Express your answer to two significant figures and include the appropriate units. Enter a positive value if the image is on the other side negative value if the image is on the same side. ANSWER: Part B Calculate the image height. Part A Express your answer to two significant figures and What is the location of the final image produced by the compound lens system? Give the x coordinate of the image. ANSWER: Express your answer in centimeters, to three significant figures or as a fraction. K = You did not open hints for this part. ANSWER: cm Problem 20.20 Now remove the two lenses at r = +20.0 cm and ar = -20.0 cm and replace them with a single lens of focal length f3 at a = 0. We want to choose this new lens so that it produces an image at the same location as before. At a distance of 6.0 meters, a person with normal vision is able to clearly read letters 1.0 cm high. Part D What is the focal length of the new lens at the origin? Part A Express your answer in centimeters, to three significant figures or as a fraction. Approximately how tall are the images of the letters on the retina? Assume that the retina is 17 mm from the lens. You did not open hints for this part. https:/session.masteringphysics.com/myct/assignmentPrint View?assignmentID=9841222 ANSWER: f3 = cm 3/1 1/22, 12:26 PM Homework 9 Express your answer with the appropriate units. ANSWER: Problem 20.17 - Enhanced - with Feedback h' = Ellen wears eyeglasses with the prescription -2.5 D. Problem 20.22 Part A What eye condition does Ellen have? ANSWER A farsighted person has a near point of 65 cm. O hyperopia myopia Part A What strength lens, in diopters, is needed to bring his near point to 25 cm? Correct Express your answer in diopters. Here we learn about the eye conditions and which lenses are needed to correct them. ANSWER: Part B P = D What is her far point without the glasses? Express your answer with the appropriate units. ANSWER: FP =