Chapter 26: Q11CQ (page 955)
What is color constancy, and what are its limitations?
We can’t see the true color of the object due to color constancy.
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Unless otherwise stated, the lens-to-retina distance is 2.00 cm.
(a) A laser vision correction reshaping the cornea of a myopic patient reduces the power of his eye by 9.00 D, with auncertainty in the final correction. What is the range of dioptres for spectacle lenses that this person might need after LASIK procedure? (b) Was the person near-sighted or farsighted before the procedure? How do you know?
A nearsighted man cannot see objects clearly beyond 20 cm from his eyes. How close must he stand to a mirror in order to see what he is doing when he shaves?
Unless otherwise stated, the lens-to-retina distance is 2.00 cm.
In a LASIK vision correction, the power of a patient’s eye is increased by 3.00 D. Assuming this produces normal close vision, what was the patient’s near point before the procedure?
Repeat the previous problem for glasses that are 1.75 cm from the eyes.
Your friends show you an image through a microscope. They tell you that the microscope has an objective with a \({\rm{0}}{\rm{.500}}\) cm focal length and an eyepiece with a \({\rm{5}}{\rm{.00}}\) cm focal length. The resulting overall magnification is\({\rm{250,000}}\). Are these viable values for a microscope?
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