5/6/2011
1
Physics 1C
Lecture 26C
"
There are two kinds of light--the glow that
illuminates, and the glare that obscures."
--James Thurber
Outline
Thin Lens equation
Image formation summary
The Eye
Lenses in series
Thin Lens Equation
Example
An object is placed 10cm to the left of a
converging lens that has a focal length of
10cm.
Describe what the resulting image will
look like (i.e. image
distance,
magnification...).
Answer
The coordinate
system defined.
The center of the
lens is the origin.
Object
N
F
No
Image
Thin Lens Equation
Answer
First, turn to the thin lens equation:
The image is at infinity.
This means that
there is no resulting image.
1
p
1
q
1
f
1
q
1
f
1
p
1
10cm
1
10cm
0
q
Thin Lens Equation
Example
An object is placed 15cm to the left of a
diverging lens that has a focal length of 10cm.
Describe what the resulting image will look
like (i.e. image
distance,
magnification...).
Answer
The coordinate system
defined.
The center of the lens
is the origin.
Object
N
F
Image
Thin Lens Equation
Answer
First, turn to the thin lens equation:
where the negative sign means that the
image is on the same side of the lens as the
object (i.e. the left side of the lens).
The magnification of the object will be:
1
p
1
q
1
f

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