thin lenses. lens types converging lenses diverging lenses f 1 : object focal point f 2 : image...
TRANSCRIPT
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Thin Lenses
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Lens Types
Converging Lenses
Diverging Lenses
f1: object focal pointf2: image focal point
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Ray Diagrams for a Converging Lens
• Ray 1 is drawn parallel to the principal axis. After being refracted, this ray passes through the focal point on the back side of the lens.
• Ray 2 is drawn through the center of the lens and continues in a straight line.
• Ray 3 is drawn through the focal point on the front side of the lens (or as if coming from the focal point if do < f) and emerges from the lens parallel to the principal axis.
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The image is virtual and upright
The image is real and inverted
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Ray Diagrams for a Diverging Lens
• Ray 1 is drawn parallel to the principal axis. After being refracted, this ray emerges such that it appears to have passed through the focal point on the front side of the lens.
• Ray 2 is drawn through the center of the lens and continues in a straight line.
• Ray 3 is drawn toward the focal point on the back side of the lens and emerges from the lens parallel to the principal axis.
![Page 6: Thin Lenses. Lens Types Converging Lenses Diverging Lenses f 1 : object focal point f 2 : image focal point](https://reader036.vdocuments.us/reader036/viewer/2022082610/56649da65503460f94a90dc0/html5/thumbnails/6.jpg)
The image is virtual and upright
![Page 7: Thin Lenses. Lens Types Converging Lenses Diverging Lenses f 1 : object focal point f 2 : image focal point](https://reader036.vdocuments.us/reader036/viewer/2022082610/56649da65503460f94a90dc0/html5/thumbnails/7.jpg)
The lens equation
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Sign Conventions for Thin Lenses• do is positive if object is in front of lens (real object).• do is negative if object is in back of lens (virtual object).
• di is positive if image is in back of lens (real image).• di is negative if image is in front of lens (virtual image).
• f is positive if the lens is converging.• f is negative if the lens is diverging.