Chapter27[1]

Chapter27[1] - Chapter 27 THE HUMAN EYE 1 The greatest...

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Chapter 27 THE HUMAN EYE: 1. The greatest refraction of light occurs at the air (n = 1.00) – CORNEA ( n = 1.38 ) interface. 2. Secondary refraction occurs at the AQUEOUS HUMOR (n = 1.33) – LENS (n = 1.40) interface. 3. The shape of the LENS , and so its focal length is adjusted by the CILIARY MUSCLE. 4. For far away objects, f . The muscle is relaxed, and the lens is flat. Stop studying now and then to focus on far away objects and you can minimize eye strain. 5. For close objects, the muscle tenses to shorten the focal length of the lens. 6. The process of changing the lens shape is called ACCOMODATON. Newborns take about 6 weeks to do this.
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The NEAR POINT (N) is the closest an object can be to the eye and still be in focus. The eye produces a real, inverted image on the RETINA. Example: N = 25 cm. Pretend the eye is a single thin lens that is 2.5 cm from the retina. What is the focal length of the eye’s lens when it is focused on a) the near point, and b) infinity?
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We are looking for f. 1 1 oi 1 1 11 1 1 a) f 2.3cm dd 2 5 c m 2 . 5 c m 1 1 b) f 2.5cm 2 . 5 c m     LENSES IN COMBINATION.
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1. Pretend that the 2 nd (right) lens isn’t there and locate the image formed by the 1 st (left) lens.
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This note was uploaded on 10/13/2011 for the course PHY 102 taught by Professor Alexandrakis during the Fall '06 term at FIU.

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Chapter27[1] - Chapter 27 THE HUMAN EYE 1 The greatest...

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