Campbell Biology: Concepts.. (Custom Package)
8th Edition
ISBN: 9781323042649
Author: Central Texas
Publisher: PEARSON
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Chapter 29, Problem 9TYK
Hold your right eye closed. With your left eye, look at the +in the image below. Starting from about two feet away, slowly bring your head closer while looking at the +. What happens to the dot when you get close to the image? What property of the eye’s structure does this exercise demonstrate?
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b) When the muscles connected to the crystalline lens contract fully, its focal length is 16.5000 cm. With this focal length, how far away must an object be to form sharply focused images on the retina? (Note: this distance is called the far point of vision.)
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Chapter 29 Solutions
Campbell Biology: Concepts.. (Custom Package)
Ch. 29 - Prob. 1CCCh. 29 - Which of the following sensory receptors is...Ch. 29 - Which of the following are not known to be present...Ch. 29 - What do the receptor cells in the lateral line...Ch. 29 - If you look away from this book and focus your...Ch. 29 - Prob. 6TYKCh. 29 - Prob. 7TYKCh. 29 - Prob. 8TYKCh. 29 - Hold your right eye closed. With your left eye,...Ch. 29 - Prob. 10TYK
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- Figure 36.18 Which of the following statements about the human eye is false? Rods detect color, while cones detect only shades of gray. When light enters the retina, it passes the ganglion cells and bipolar cells before reaching photoreceptors at the rear of the eye. The iris adjusts the amount of light coming into the eye. The cornea is a protective layer on the front of the eye.arrow_forward4. (a) David cannot view objects clearly if they are further than 0.80 m. His lens-to-retina distance is 2.0 cmWhat is the problem with his eyes? What should be the optical power of his corrective glasses? Neglectthe distance between the glasses and his eyes.arrow_forwardTeleost focus on distant objects by _____. moving their lens forward in their eye further from the retina moving their lens backward in their eye closer to the retina contracting their ciliary muscle to release tension on the zonular fibers contracting their ciliary muscle to increase tension on the zonular fibers relaxing their ciliary muscle to put tension on the ciliary fibersarrow_forward
- Figure Q9–2 shows a diagram of the human eye. Therefractive indices of the components in the light path are:cornea 1.38, aqueous humor 1.33, crystalline lens 1.41, andvitreous humor 1.38. Where does the main refraction—themain focusing—occur? What role do you suppose the lensplays?arrow_forwardAre the blind spots of your right and left eyes at the same distance?arrow_forwardName the part of eye which refract eye rays to focus on retina.arrow_forward
- A person with a myopic eye cannot see objects beyond 1.2 m distinctly. What should be the corrective lens used to restore proper vision?arrow_forwardHow can you compare various parts of eye with a photographic camera?arrow_forward1) Teleost focus on nearby objects by _____. A) moving their lens forward in their eye further from the retina B) moving their lens backward in their eye closer to the retina C) contracting their ciliary muscle to release tension on the zonular fibers D) contracting their ciliary muscle to increase tension on the zonular fibers E) relaxing their ciliary muscle to put tension on the ciliary fibersarrow_forward
- 6. After focusing on the screen, there should have been a difference upon opening your eyes after closing your eyes for 90 instead of 10 seconds. What was this difference? EXPLAIN the results, including what happened to the ciliary muscles and lens. Note: If your results were atypical, you should also explain what should have happened and why.arrow_forwardIf you look at 20/20 line and it was in focus where in the eye was the image projected onto of a person's eyesight is worse than 20/20, where is that image projected?arrow_forwardWhat is your visual acuity?arrow_forward
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