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- 1. Describe the role of the lens in vision.4. (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.4. Describe the roles of the retina and the optic nerve in vision.
- 1) When the ciliary muscle in the amniote eye contracts its diameter ______ and the tension of the zonular fibers connecting it to the lens is released. This causes the lens to ______. A) increases, be stretched to a more flattened state" B) increases, be squeezed to a more rounded shape" C) decreases , be stretched to a more flattened shape" D) decreases, rebound to a more rounded shape"7) List and discuss the parts of the eye.1. What happens if you try to use the coarse adjustment when the 10X lens is in place? 2. Assuming the light is on and the oculars are in place, what are the next 2 steps? (Answer in 3-5 sentences)
- 1) In the amniote eye, light rays are bent by the greatest amount when they pass from the _______." A) cornea into the lens B) air into the cornea C) aqueous humor into the lens D) front of the lens to the back of the lens 2) When a light ray passes into lens at a more perpendicular angle _____ then when it passes into the lens at a more oblique angle. A) it undergoes more bending B) it undergoes less bending C) the amount of bending the light ray undergoes is independent of the angle at which it hits the lens8) List and discuss the parts of the ear, be sure to include the three small bones of the middle ear.The eyes of vertebrates and cephalopods are similar in structure and function. A difference between the vertebrate eye and the cephalopod eye is that the vertebrate eye has: a. an iris surrounding the pupil, whereas in cephalopods the pupil surrounds the iris. b. a lens that changes shape when focusing, whereas in cephalopods the lens moves back and forth to focus. c. a retina that moves in the socket when recording the image, whereas in cephalopods the retina changes shape when stimulated. d. a pupil that shrinks in size in bright light, whereas cephalopods have a pupil that enlarges in bright light. e. retinal synthesized from vitamin A, whereas cephalopods lack retinal.