Chapter 38- College Physics, 7^th ed. (Sears, Zemansky, & Young)

38-1. 30 cm: a) 30 cm to the right of the lens b) –1.00 c) real d) inverted

20 cm: a) 60.0 cm to the right of the lens b) –3.00 c) real d) inverted

10 cm: a) 30 cm to the left of the lens b) +3.00 c) virtual d) erect

5 cm: a) 7.50 cm to the left of the lens b) + 1.50 c) virtual d) erect

38-2. 30 cm: 7.50 cm to left of lens; +0.25; virtual; erect

20 cm: 6.67 cm to left of lens; +0.333; virtual; erect

10 cm: 5.00 cm to left of lens; +0.500; virtual; erect

5 cm: 3.33 cm to left of lens; +0.667; virtual; erect

38-3. 35 cm to the left of the lens; 2.5 cm tall; inverted

38-4. a) +6.67 cm; converging b) 2.00 cm; inverted

38-5. a) –6.67 cm; diverging b) 0.5 cm; erect

38-6. 18 cm to left of lens; 2.25 cm to right of lens; real

38-7. 1.75 cm to the left of the lens; 14.0 cm to the left of the lens; virtual

38-8. a) 0.45 m b) inverted c) +0.338 m; converging

38-9. ?

38-10. 5.01 cm

38-11. f = ± 33.3 cm, ± 11.1 cm

38-12. 7.84 cm to the left of lens

38-13. a) image formed by the first surface b) + 20 cm c) real d) inside rod, 40 cm to the left of the second vertex

38-14. a) 50.7 cm to left of left-hand end b) +2.00

38-15. 3.00 cm from the center of the sphere

38-16. a) –15 cm b) virtual c) 6.67 cm to right of second vertex d) real; inverted e) 0.667 mm

38-17. a) 75 cm to the right of the lens; 1.5 cm; inverted b) 90 cm to the right of the second lens; 3.00 cm; erect c) 16.2 cm to the right of the second lens; 0.692 cm; inverted d) 210 cm to the left of the second lens; 9.00 cm; erect

38-18. 140 cm to right of third lens

38-19. 3.6 cm from either end of the eyepiece

38-20. a) 52 cm to left of first lens b) virtual c) 10 mm; erect

38-21. a) 66.7 cm in front of the eye b) 133 cm in front of the eye

38-22. 0.743 cm

38-23. 0.691 cm

38-24. a) +2.67 diopters b) –1.67 diopters

38-25. 1.54 m

38-26. 2.7 mm

38-27. a) 35 mm b) 200 mm

38-28. 5.06 cm; yes

38-29. 1/240 s

38-30. a) 3.57 cm b) 1/25 s

38-31. a) 10.2 cm b) No

38-32. a) 12.2 cm b) 1.58m x 2.36 m

38-33. 2.25 cm; 22.5 cm from the lens

38-34. a) 5.0 b) 5.0 cm

38-35. a) 9.38 cm b) 2.67 mm

38-36. a) 1.76 cm b) 10.2 c) 102

38-37. a) 642 b) 42.5

38-38. a) 433 b) 2.3 x 10^-4 mm

38-39. -40

38-40. 15.7 cm

38-41. a) –30 b) 31.0 cm

38-42. convex; 4.67

38-43. a) 4.0 cm from the screen; 12.0 cm from the screen

b) 4.0 cm from the screen: m = -0.333; 12 cm from the screen: m = -3.00

38-44. 2.25 cm

38-45. –18.8 cm

38-46. b) 9.6 cm

38-47. ?

38-48. first image: b) 59.5 cm to right of lens c) real d) inverted second image: b) 59.5 cm to right of lens c) real d) erect

38-49. a) 8.80 m b) 5.88 m

38-50. 4R from center of sphere, on opposite side from object

38-51. 48.8 cm

38-52. 0.9 cm

38-53. 5.33 cm below the lower face of the plate

38-54. a) yes b) +7.5 diopters

38-55. 7.99 mm

38-56. 2.68 cm; elongated

38-57. a) + 408 b) 23.3 cm

38-58. a) –4.00 b) 3.2 cm c) 9.16°

38-59. b) 20 cm c) Telescope of Problem 38-58: 100 cm; Galilean telescope: 60 cm

38-60. lens is 41.1 cm from vertex of mirror; final image is 10 cm to right of lens and is real

38-61. a) 18 cm from the center of the goblet, on the same side as the incident rays b) 8.03 cm from the center of the goblet, on the side opposite from the incident rays

38-62. a) A: 32.5 cm to right of lens; 4.94 cm below optic axis

B: 42.3 cm to right of lens; 24.6 cm below optic axis

C: 36.0 cm to right of lens; 12.0 cm below optic axis

b) 22.0 cm

38-63. a) Water affects the refractive properties of the eye b) +0.993 cm

38-64. 1.2 R to right of center of sphere

38-65. a) 0.276 m b) 0.276 m

38-66. a) 720 cm to left of lens b) real c) erect d) 36 mm