Experiment
Introductory
Optics
System
Converging Lens Image
and Object
Relationshie§.

EQUIPMENT
NEEDED:
Optics Bench
75 mm Focal Length
Convex Lens
Component
Holders
(3)
Crossed
Arrow
Target
Light Source
Crossed
Arrow Target
Viewing
Screen.
Viewing
Screen
Figure 7.1:
Equipment
Setup
Introduction
Given a lens of any shape and index of refraction, you could determine the shape and location of
the images it forms based only on the Law of Refraction.
You need only apply the law along with
some of the ray tracing techniques you have already used.
However, for spherical lenses (and for
spherical mirrors as well), there is a more general equation that can be used to determine the
location and magnification
of an image. This equation is called the Fundamental Lens equation:
lid
+
lid.
=
lIf
o
I
where f is the focal length of the lens, and do and d, are the distance from the mirror to the image
and object respectively (see Figure 7.1). The magnification of the image is given by the equation:
rn =
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 Spring '11
 Page
 fundamental lens equation, Crossed Arrow Target

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