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25_InstSolManual_PDF_Part4

25_InstSolManual_PDF_Part4 - 25-4 Chapter 25 25.16 Set Up 1...

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25.16. Set Up: From the shape of the cornea shown in the figure, and Solve: and The power is and the lens is diverging. 25.17. Set Up: From Table 25.1, the near point is 10 cm. Solve: For For Reflect: The eye changes the focal length of its lens by using muscles to change the shape of the lens. 25.18. Set Up: From Table 25.1, the near point is 22 cm. Solve: (a) The power is (b) so the image is inverted. so the image is real. (c) 25.19. Set Up: For a double convex lens, and To compute in diopters, and must be expressed in meters. Maximum power corresponds to minimum focal length. (a) maximum power: minimum power: (b) (c) For a distant object and At maximum power, so (d) At minimum power, so Reflect: Since the distance from the lens to the retina is fixed, this eye won’t focus clearly on both objects. 25.20. Set Up: For an object 25.0 cm from the eye, the corrective lens forms a virtual image at the near point of the eye. Solve: (a) The person is farsighted. (b) A converging lens is needed. (c) The power is 1 0.562 m 5 1 1.78 diopters. f 5 ss r s 1 s r 5 1 25.0 cm 21 2 45.0 cm 2 25.0 cm 2 45.0 cm 5 1 56.2 cm. 1 s 1 1 s r 5 1 f . s r 5 sf s 2 f 5 1 25 cm 21 0.667 cm 2 25 cm 2 0.667 cm 5 0.685 cm 5 6.85 mm. 1 s 1 1 s r 5
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