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What Are Thin Lenses? What Are They Used To do?
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Converging Lenses&
Their Application
Dan LiSUNY-Stony Brook
11/07/2002
OUTLINEThin Lenses
Converging lenses Focal length & Geometric Construction Thin Lens Equation
Applications Cameras Projector Simple Magnifier
What Are ThinLenses?
What Are TheyUsedTo do?
Focal LengthFocal PointFocal LengthSymbol: fTwo Focal Point Two Focal LengthSame Focal Length
Geometric Construction A ray passing through the center is un-deviated.A ray which is parallel to the principal axis of the lens will pass through the focal point after refraction.
Thin-lens Equation
o: object distancei: image distancef: focal lengthM=-i/o : magnification
The Relation between Object & Image
1 Obj>2f f<Ima<2f -1<M<02 f<Obj<2f Ima>2f M<-1 3 0<Obj<f Ima<0 M>1
Cameras
How Cameras Work
Projector
How Projector Works
How Magnifier Works
More Applications
Thank you!