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Chapter 26: Q13PE (page 956)
The power of a physician’s eyes is 53.0 D while examining a patient. How far from her eyes is the feature being examined?
The feature is 33.3 cm from the physician's eyes.
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(a) During laser vision correction, a brief burst of 193nm ultraviolet light is projected onto the cornea of the patient. It makes a spot 1.00mm in diameter and deposits 0.500mJ of energy. Calculate the depth of the layer ablated, assuming the corneal tissue has the same properties as water and is initially at 34.00C. The tissue’s temperature is increased to 1000Cand evaporated without further temperature increase. (b) Does your answer imply that the shape of the cornea can be finely controlled?
A myopic person sees that her contact lens prescription is –4.00 D. What is her far point?
Propose a way to study the function of the rods alone, given they can sense light about 1000 times dimmer than the cones.
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\({\rm{26}}{\rm{.17}}\).)
How does the NA of a microscope compare with the NA of an optical fiber?
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