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Chapter 26: Q20CQ (page 955)
List the various types of aberrations. What causes them and how can each be reduced?
The different types of aberrations are Chromatic, coma, and spherical.
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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?
Why not have the objective of a microscope form a case 2 image with a large magnification? (Hint: Consider the location of that image and the difficulty that would pose for using the eyepiece as a magnifier.)
Unless otherwise stated, the lens-to-retina distance is 2.00 cm.
What is the near point of a person whose eyes have an accommodated power of 53.5 D?
A severely myopic patient has a far point of 5.00 cm. By how many diopters should the power of his eye be reduced in laser vision correction to obtain normal distant vision for him?
(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?
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