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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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If you want your microscope or telescope to project a real image onto a screen, how would you change the placement of the eyepiece relative to the objective?
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?
(a) What magnification is produced by a 0.150 cm focal length microscope objective that is 0.155 cm from the object being viewed?
(b) What is the overall magnification if an eyepiece (one that produces a magnification of 8.00 ) is used?
A person with presbyopia has lost some or all of the ability to accommodate the power of the eye. If such a person’s distant vision is corrected with LASIK, will she still need reading glasses? Explain.
You are using a standard microscope with an \({\rm{0}}{\rm{.10NA 4 \times }}\) objective and switch to a \({\rm{0}}{\rm{.65NA 40 \times }}\) objective. What are the acceptance angles for each? Compare and comment on the values. Which would you use first to locate the target area on of your specimen? (See Figure\({\rm{26}}{\rm{.17}}\).)
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