lecture19 - Physics 102: Lecture 19 Lenses and your EYE...

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Unformatted text preview: Physics 102: Lecture 19 Lenses and your EYE Ciliary Muscles 40 3 Cases for Converging Lenses Image Object Upright Enlarged Virtual Inside F Image Object Inverted Enlarged Real Between F & 2F Object Image Inverted Reduced Real Past 2F Only 1 Case for Diverging Lenses F F Object P.A. Image is always virtual, upright, and reduced . 45 Image Review of Lenses Preflight 18.8 P.A. F 5 Focal point determined by geometry and Snells Law: n 1 sin( 1 ) = n 2 sin( 2 ) Fat in middle = Converging Thin in middle = Diverging Larger n 2 /n 1 = more bending , shorter focal length . Smaller n 2 /n 1 = less bending , longer focal length . n 1 = n 2 => No Bending, f = infinity Lens in water has larger focal length since n 2 /n 1 is smaller! n 1 <n 2 Preflight 19.1 8 A converging lens is used to project a real image onto a screen. A piece of black tape is then placed over the upper half of the lens. 8 Preflight 19.1 Still see entire image (but dimmer)! (37% got correct) There are still rays from the image bouncing off the lower half of the lens that will project the image. Lens Equation Same as mirror equation 11 cm 10 1 1 cm 15 1 = + i d cm 30 = i d o i d d m- = 2- = F F Object P.A. d o d i f Image 1 d o + 1 d i = 1 f d o = distance object is from lens: Positive: object in front of lens Negative: object behind lens d i = distance image is from lens: Positive: real image (behind lens) Negative: virtual image (in front of lens)...
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This note was uploaded on 01/25/2012 for the course PHYS 102 taught by Professor Lee during the Spring '08 term at University of Illinois, Urbana Champaign.

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lecture19 - Physics 102: Lecture 19 Lenses and your EYE...

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