Download - 24 Geometric Optics
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24 Geometric Optics
Water drop as a converging lens
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Reflection at a Plane Surface
Image and ObjectRays diverging from one point P (object) recombine at point P’ by mirror or lens— an image formed.
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Object & Image Distances 1. Object distance2. Image distance3. Real image4. Virtual image5. Magnification
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Sign Ruless: The (real) object distance is positive. (The distance is negative for a virtual object.) s’: The image distance (s’) is positive for all real images and negative for virtual images. y and y’: Heights are positive if measured upward from the principal axis and negative if measured downward. m: Magnification is positive if the image is erect and negative when inverted. f: The focal length is positive for converging mirrors and lenses, and negative for diverging ones.
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Reflection at a Spherical Surface
Rss
2
'
11Mirror Equation
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Focal Point & Focal Length-Concave
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Image Construction—Concave
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Focal Point & Focal Length-Convex
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Image Construction—Convex
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Image Construction—Principal Rays
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Image Construction—Practice
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Refraction at a Spherical Surface
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How Deep is the Pool?
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Thin Lenses—Converging
s
s
y
ym
fss
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1
'
11
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Thin Lenses—Diverging
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Thin-Lens Equations
s
s
y
ym
RRn
ffss
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11
'
11
21
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Imaging thru Thin –Lens: Principal Rays
http://www.mtholyoke.edu/~mpeterso/classes/phys301/geomopti/lenses.html
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Principal Rays: Practice
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Summary: Reflection at a Plane Surface
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Summary: Reflection at a Spherical
Surface
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Summary: Graphical Methods for Mirrors
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Summary: Refraction at a Spherical Surface & Thin
Lenses
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Summary: Graphical Methods for Lenses
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Example: The Eye’s Lens
The least distance of distinct vision (LDDV): 25 cm ~ 10 in
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Mirror/Lens Equation
s
s
y
ym
RRnf
Rf
f
fss
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2
1
'
11
21
LensThin
(-)convex or )( concave
mirror plane
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Homework Ch24Problems:: 1, 4, 5, 6, 13, 20, 29, and 32
Answers to multiple choice problems
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quiz(1) Construct the images using principal rays for a converging lens and a convex mirror, respectively. (2) Find the locations of images using lens/mirror equation (f = +5 or -5 cm, s = 8 cm).
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Test 3 Grade Distribution
# of Students: 30Average: 12.8=64%
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Test 3 Grade Distribution# of Students: 21Average: 11.7=59%