Ch23_part2

Ch23_part2 - Chapter 23, Part 2 PHY213 Thin Lenses A thin...

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Chapter 23, Part 2 PHY213 1 Thin Lenses s A thin lens consists of a piece of glass or plastic, ground so that each of its two refracting surfaces is a segment of either a sphere or a plane s Lenses are commonly used to form images by refraction in optical instruments Thin Lens Shapes s These are examples of converging lenses s They have positive focal lengths s They are thickest in the middle More Thin Lens Shapes s These are examples of diverging lenses s They have negative focal lengths s They are thickest at the edges Focal Length of Lenses s The focal length, ƒ, is the image distance that corresponds to an infinite object distance s This is the same as for mirrors s A thin lens has two focal points, corresponding to parallel rays from the left and from the right s A thin lens is one in which the distance between the surface of the lens and the center of the lens is negligible
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Chapter 23, Part 2 PHY213 2 Focal Length of a Converging Lens s The parallel rays pass through the lens and converge at the focal point
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This note was uploaded on 08/25/2009 for the course PHY 213 taught by Professor Cao during the Summer '08 term at Kentucky.

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Ch23_part2 - Chapter 23, Part 2 PHY213 Thin Lenses A thin...

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