Title: Lecture 17 Ray Optics-3 Chapter 23
1Lecture 17Ray Optics-3 Chapter 23
- PHYSICS 270
- Dennis Papadopoulos
- March 22, 2010
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3Total Internal Reflection
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5Image by Refraction
6EXAMPLE 23.13 A goldfish in a bowl
7What is a lens?
Device that provides a capability to create
bright and well focused images. How?
Use Refraction to create images out of divergent
light rays
8Converging and Diverging Lenses
9Thin Lenses Real Image Special Rays
Thin lens-gt dltltf,s,s
Inverted Image
10Thin Lenses Ray Tracing
11Tactics Ray tracing for a converging lens
12Tactics Ray tracing for a converging lens
13Lateral Magnification
The image can be either larger or smaller than
the object, depending on the location and focal
length of the lens. The lateral magnification m
is defined as
- A positive value of m indicates that the image is
upright relative to the object. A negative value
of m indicates that the image is inverted
relative to the object. - The absolute value of m gives the size ratio of
the image and object h'/h m .
14sgtf ?h/hs/s
15Virtual Image
slt0 ? mgt0 image upright
16EXAMPLE 23.10 Magnifying a flower
sltf
17Diverging Lenses
Thicker at the edges
Demagnification
18Diverging lenses Ray Tracing