25_InstSolManual_PDF_Part6 - 25-6 Chapter 25 The near point...

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The near point is 79.8 cm from the eye. (b) so Find for gives The far point is 76.9 cm from the eye. 25.27. Set Up: To correct the near vision of the hyperopic eye, the corrective lens forms a virtual image at the near point for an object that is 25 cm from the eye. To correct the far vision of the myopic eye, the corrective lens forms a virtual image at the far point for an object that is very far from the eye. Power in diopters equals when is in meters. (a) (b) 25.28. Set Up: When the object is at the focal point of the lens and therefore the image is at infinity, Solve: (a) (b) The object is at the focal point of the lens, 8.3 cm from the lens. 25.29. Set Up: When the object is at the focal point of the lens and the image therefore is at infinity, then Solve: (a) (b) The object is at the focal point of the lens, so the lens is 11.5 cm from the stamp. 25.30. Set Up: When the object is at the focal point the image is at infinity and Solve: (a) (b) The object can be brought as close as the focal length of the lens, 6.00 cm. 25.31. Set Up: The image is not at infinity, so the equation doesn’t apply. The image is virtual, so
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