L29Note_LensApplication(9)

L29Note_LensApplication(9) - Applications Refraction 25.1 -...

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1 1 PHYS 112, SP08, Cui Lecture 29, 04/23/08 Applications • 25.1 - 25.5 2 PHYS 112, SP08, Cui Lecture 29, 04/23/08 Review • Refraction – Total internal reflection • Thin Lenses – Lens Equation f q p 1 1 1 = + p q h h M = = ' 3 PHYS 112, SP08, Cui Lecture 29, 04/23/08 Difference b/w Mirror and Lens 4 PHYS 112, SP08, Cui Lecture 29, 04/23/08 Magnifying Glass • A converging lens – When __________ 5 PHYS 112, SP08, Cui Lecture 29, 04/23/08 The Camera • A converging lens – When _______ Real, inverted image 6 PHYS 112, SP08, Cui Lecture 29, 04/23/08 The Human Eye • Like the camera, a converging lens Light enters the eye and is bent or refracted by the cornea (the window of the eye) through the pupil (the opening in the iris). This light passes through the lens (located behind the pupil). This completes refraction by fine tuning the focused light onto the retina . The retina changes the light (energy) into electric impulses that are carried through the optic nerve to the vision center (occipital cortex) of the brain where the image is interpreted. 7 PHYS 112, SP08, Cui Lecture 29, 04/23/08 The Human Eye Accommodation : the process of changing the lens shape as the eye focuses at different distance. ________: the most distance point on which the complete relaxed
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L29Note_LensApplication(9) - Applications Refraction 25.1 -...

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