102 lect19_handout

# 102 lect19_handout - Physics 102 Lecture 19 Lenses and your...

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Physics 102: Lecture 19, Slide 1 Physics 102: Lecture 19 Lenses and your EYE Ciliary Muscles

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Physics 102: Lecture 19, Slide 2 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
Physics 102: Lecture 19, Slide 3 Only 1 Case for Diverging Lenses F F Object P.A. Image is always virtual, upright, and reduced . Image

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Physics 102: Lecture 19, Slide 4 Preflight 19.1 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.
Physics 102: Lecture 19, Slide 5 Lens Equation Same as mirror equation 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) f = focal length lens: • Positive: converging lens • Negative: diverging lens

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Physics 102: Lecture 19, Slide 6 Multiple Lenses Image from lens 1 becomes object for lens 2 1 f 1 f 2 2 Lens 1 creates a real, inverted and enlarged image of the object. Lens 2 creates a real, inverted and reduced image of the image from lens 1. The combination gives a real, upright, enlarged image of the object.