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Review Questions Chapter 9 Answer Key

Review Questions Chapter 9 Answer Key - Review Questions...

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Review Questions Chapter 7 Answer Key From Textbook 1. Why is a scuba mask necessary for clear vision under water? The refractive power of the cornea depends on the slowing down of light at the air- cornea interface. Replacing air with a medium, such as water, which allows light to pass at about the same speed as the eye eliminates the refractive power of the cornea. When you open your eyes under water, the water-cornea interface has very little focusing power and things look blurred. A scuba mask restores the air-cornea interface, and consequently, the refractive power of the cornea. 2. What is myopia and how is it corrected? Myopia, or nearsightedness, occurs when the eyeball is too long. Parallel rays from a distant light source, which are bent by the cornea and the lens normally converge at exactly the same plane as the retina. When the eyeball is too long, the rays of light converge and cross before the retina. As a result, the image on the retina is a blurred circle rather than a point. To see distant objects clearly, nearsighted people must use
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