Section 10 - Nearsightedness
10.1 Nellie is nearsighted. She cannot focus on objects farther than 40.0 cm from her unaided eye. (a) Does she require a
converging or diverging lens to correct her vision? (b) What focal length must her corrective contact lens have to bring into
focus the most distant objects?
(a) Converging Diverging
(b) cmSection 13 - Angular size
13.1 A quarter is 2.3 cm across. What is its approximate angular size in radians when viewed from 3.5 meters away?
radians
13.2 A penny is 1.8 cm across. What is its approximate angular size when viewed from 1.6 meters away? State your answer in
degrees.
°
13.3 You measure a crater on the moon to have an angular size of 3.64×10í^4 radians. The distance to the moon is 3.84×10^8 m.
What is the approximate diameter of the crater?
m
13.4 The Hubble Space Telescope has a resolution of about 2.4×10í^7 radians for visual wavelengths. (a) If you were to view a
quarter at a distance such that it subtended the same angle, how far away would it have to be? A quarter is 2.3 cm in
diameter. (b) The resolution of the Hubble at infrared wavelengths is about 9.7×10í^7 radians. How far away would a quarter
have to be to subtend this angle?
(a) m
(b) m(^626) Copyright 2000-2007 Kinetic Books Co. Chapter 33 Problems