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Chapter 26: Q22PE (page 956)
: A mother sees that her child’s contact lens prescription is 0.750 D. What is the child’s near point?
The child's near point is -0.308 m.
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Consider a telescope of the type used by Galileo, having a convex objective and a concave eyepiece as illustrated in Figure 26.23(a). Construct a problem in which you calculate the location and size of the image produced. Among the things to be considered are the focal lengths of the lenses and their relative placements as well as the size and location of the object. Verify that the angular magnification is greater than one. That is, the angle subtended at the eye by the image is greater than the angle subtended by the object.
Unless otherwise stated, the lens-to-retina distance is 2.00 cm.
What was the previous far point of a patient who had laser vision correction that reduced the power of her eye by 7.00 D, producing normal distant vision for her?
List the various types of aberrations. What causes them and how can each be reduced?
A large reflecting telescope has an objective mirror with a 10.0m radius of curvature. What angular magnification does it produce when a 3.00m focal length eyepiece is used?
If the lens of a person’s eye is removed because of cataracts (as has been done since ancient times), why would you expect a spectacle lens of about \({\rm{16 D}}\) to be prescribed?
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