lecture9 - Lenses Light and Color for Nonscientists PHYS...

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Lenses Light and Color for Nonscientists PHYS 1230 Geometrical optics - how do we make images? Ray tracing for lenses
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LENSES AND IMAGES Lenses are used in - • eyeglasses • magnifying glasses • cameras • telescopes • eyelens
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LAW OF REFRACTION • Light going from a substance of small n to a substance of large n is bent TOWARD the normal • Light going from a substance of large n to a substance of small n is bent AWAY from the normal normal to surface glass or water Diagram works in either direction incident rays refracted rays
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How do rays behave at spherical convex interfaces? Convex glass surfaces are focusing Concave glass surfaces are defocusing convex interface C F glass Rays parallel to the axis are deflected through the focus
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How do rays behave at spherical convex interfaces? convex interface C F glass F Rays parallel to the axis are deflected through the focus
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How do rays behave at spherical convex interfaces? convex interface C F glass Rays from the focus are made parallel to the axis
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How do rays behave at spherical interfaces? Convex glass surfaces are focusing Concave glass surfaces are defocusing concave interface F glass C F Rays parallel to the axis are deflected as if they emerged from the focus
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How do rays behave at spherical convex interfaces? concave interface F glass C F Rays parallel to the axis are deflected as if they emerged from the focus
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Thin Lenses
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Ray Tracing for Thin Lenses RULE #1: A ray through the center of the lens is not bent RULE #2: A ray parallel to the axis is deflected through F (or as if it came from F) RULE #3: A ray from F is deflected parallel to the axis (this rule is the reverse of #2)
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Ray Tracing for Thin Lenses Notice how we approximate what should be 2 bends with 1 bend
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Ray Tracing for Thin Lenses Where will the images be?
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lecture9 - Lenses Light and Color for Nonscientists PHYS...

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