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

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Physics 102: Lecture 19 Lenses and your EYE Ciliary Muscles

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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

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Review of Lenses Preflight 18.8 P.A. F 5 Focal point determined by geometry and Snell’s Law: n 1 sin( θ 1 ) = n 2 sin( θ 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.

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

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