PASCO OS-8500 INTRODUCTORY OPTICS SYSTEM - Manual (Page 51)

012-02744K Introductory Optics System
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EQUIPMENT NEEDED:
-Optics Bench -75 mm Focal Length Convex Lens
-150 mm Focal Length Convex Lens -Viewing Screen
-Component Holders (2)
Figure 20.1 The Magnifier
Experiment 20: The Magnifier
Introduction
When an object is located between a converging lens and its focal point, a virtual, magnified, uninverted
image is formed. Since the image is not real, it can not be focused onto a screen. However, it can be
viewed directly by an observer.
Procedure
Set up a magnifier as shown in Figure 20.1 First try it with the 75 mm focal length lens, and then with
the 150 mm focal length lens. For each lens, adjust the distance between the object (the Viewing Screen)
and the lens so the magnification is a maximum and the image is clearly focused.
Examine Table 18.1 from Experiment 18.
➀ Does the Fundamental Lens Equation place any
limit on the magnification, m, that a lens can
produce? ______________________________
______________________________________
_____________________________________.
➁ Looking through the lenses, which lens seems to
provide the greater magnification? __________
______________________________________
_____________________________________.
Figure 20.2 Angular Magnification
f f
d
o
d
i
d
i
d
o
d
i
d
i
h
o
d
o
θ
eye
eye of the
observer