A nearsighted man wears eyeglasses whose lenses have a focal length of –0.255. How far away is his far point?
Answer to relevant QuestionsAn eyeglass lens with a power of + 2.8 D allows a far-sighted person to read a book held at a distance of 25 cm from her eyes. At what distance must she hold the book to read it without glasses? Bifocal glasses are used to correct both nearsightedness and farsightedness at the same time (Fig. 25.23). If the near points in the right and left eyes are 35.0 cm and 45.0 cm, respectively, and the far point is 220 cm for ...A physics student uses a converging lens with a focal length of 14 cm to read a small measurement scale. (a) Maximum magnification is achieved if the image is at (1) the near point, (2) infinity, (3) the far point. Explain. ...A compound microscope has an objective lens with a focal length of 0.50 cm and an eyepiece with a focal length of 3.25 cm. The separation distance between the lenses is 22 cm. (a) What is the total magnification? (b) ...A certain farsighted person has a near point of 50 cm. (a) Which type of contact lenses, (1) converging, (2) diverging, or (3) (2) diverging, or(3) bifocal, should an optometrist prescribe to enable the person to see ...
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