25_InstSolManual_PDF_Part5

25_InstSolManual_PDF_Part5 - Optical Instruments 25-5 25.21...

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25.21. 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. The distances from the corrective lens are and Solve: The power is Reflect: In Problem 25.20 the contact lenses have power 1.78 diopters. The power of the lenses is different for ordi- nary glasses versus contact lenses. 25.22. Set Up: For an object very far from the eye, the corrective lens forms a virtual image at the far point of the eye. Solve: (a) The person is nearsighted. (b) A diverging lens is needed. (c) so The power is 25.23. Set Up: For an object very far from the eye, the corrective lens forms a virtual image at the far point of the eye. The distances from the lens are and Solve: so The power is 25.24. Set Up: To correct the close vision, for an object 25.0 cm from the eye the lens forms a virtual image 35.0 cm from the eye. For a distant object the corrective lens forms a virtual image 50.0 cm from the eye. Solve: (a) The power is (b) gives The power is 25.25.
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