lecture26

# lecture26 - Physics 2102 Jonathan Dowling Lecture 26...

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Lecture 26 Lecture 26 Ch. 34 Ch. 34 Physics 2102 Jonathan Dowling Optics: Images — Lenses Optics: Images — Lenses

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Thin Lenses Thin Lenses f i p 1 1 1 = + For small angles and thin lenses, Convergent: f positive Divergent: f negative ÷ - - = 2 1 1 1 ) 1 ( 1 r r n f Lens maker’s equation Convergent lens Divergent lens
Locating Images by Drawing Rays 1. A ray of direction initially parallel to the axis will pass through the focal point. 2. A ray that initially has a direction that passes through the focal point will emerge parallel to the central axis. 3. A ray going through the center of the lens will be undeflected. The image of a point appears where all rays emanating from a point intersect.

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An object placed beyond a convergent lenses’ focal point , will produce a real, inverted image on the other side of the lens. (This is the principle used in movie projectors). An object placed between a convergent lens and its focal point will produce a virtual image on the same side as the object. (Contact lenses for farsightedness, magnifying glasses.) Divergent lenses always produce a virtual image on the same side as the object (Contact lenses for nearsightedness). Real images have image distance +
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## This note was uploaded on 11/18/2011 for the course PHYSICS 2102 taught by Professor Dowling during the Fall '10 term at LSU.

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lecture26 - Physics 2102 Jonathan Dowling Lecture 26...

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