BearCh09-ACRQedt - Chapter 09 The Eye Answers to Chapter...

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Chapter 09 – The Eye Answers to Chapter Review Questions Page 1 of 4 Copyright © 2007. Lippincott Williams & Wilkins. Ancillary material to accompany Bear et al.: Neuroscience: Exploring the Brain, 3e Question 1: What physical property of light is most closely related to the perception of color? Answer: Light is electromagnetic radiation, which has three properties: wavelength, frequency, and amplitude. Wavelength is closely related to the perception of color because wavelengths of 400-700 nm are visible to the naked human eye. Within this visible spectrum, different wavelengths appear as different colors. Question 2: Name eight structures in the eye that light passes through before it strikes the photoreceptors. Answer: The eight structures of the eye through which light passes before striking the photoreceptors are the cornea, the aqueous humor, the lens, the vitreous humor, the ganglion cell layer, the inner plexiform layer, the inner nuclear layer, and the outer plexiform layer. Question 3: Why is a scuba mask necessary for clear vision under water? Answer: 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. Question 4:
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BearCh09-ACRQedt - Chapter 09 The Eye Answers to Chapter...

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