A1258690325sNuTz - PowerPoint PPT Presentation

Title: A1258690325sNuTz


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Spherical refracting surfaces - Six cases
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• Sign Convention to be used in the optics
  equations
• The object distance p is positive for a real
  object. It would be negative for a virtual
  object, but that is a rare situation.
• The image distance i is positive for a real image
  and negative for a virtual image.
• Radii of curvature get their sign based on
  whether the centers of curvature are on the
  R-side or V-side.

From posted Practical Rules on Lecture
Materials page
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V-side So r lt 0 i lt 0
V-side So i lt 0
R-side
R-side So r gt 0
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V-side So i lt 0
R-side So r gt 0
V-side So r lt 0 i lt 0
R-side
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Converging Lens (f gt 0)
Focal point
Diverging Lens (f lt 0)
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Converging Lens
f gt 0
Focal point
f lt 0
Diverging Lens
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Converging Lens
f gt 0
Focal point
f lt 0
Diverging Lens
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Locating the Image
(From posted Practical Rules on Lecture
Materials page)
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Magnifying glass
Typical near point
Angular magnification
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Simple thin-lens microscope
Not to scale.
s tube length
The eyepiece acts as a magnifying glass for the
image from the objective lens. The final
magnification M is the product of the lateral
magnification m of the objective lens and the
angular magnification m? of the eyepiece.
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Refracting telescope
?ey
Not to scale.
A distant object subtends an angle ?ob. The
virtual image viewed through the telescope
subtends ?ey.
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Eyeglasses
myopic eye (shortsighted)
corrected with diverging lens
hyperopic eye (farsighted)
corrected with converging lens