PASCO OS-8500 INTRODUCTORY OPTICS SYSTEM - Manual (Page 37)

012-02744K Introductory Optics System
®
31
EQUIPMENT NEEDED:
-Optics Bench -Light Source
-Ray Table and Base -Component Holder (2)
-Slit Plate -Cylindrical Lens
-Parallel Ray Lens -Slit Mask
Experiment 13: Image Formation with Cylindrical Lenses
Figure 13.1 Equipment Setup
Introduction
You have investigated image formation through reflection. The principles at work in image formation
through refraction are analogous. Similar ray tracing techniques can be used to determine the form and
location of the image. The important differences are (1) the Law of Refraction replaces the Law of
Reflection in determining the change in direction of the incident rays; and (2) the bending of the rays
takes place at two surfaces, since the light passes into and then out of the lens.
In this experiment, you will use the Ray Table to study the properties of image formation with cylindrical
lenses. The properties you will observe have important analogs in image formation with spherical
lenses.
Procedure
Set up the equipment as shown in Figure 13.1. Position the Cylindrical Lens on the Ray Table so the rays are
all incident on the flat surface of the lens.
Focal Point
Adjust the position of the Parallel Ray Lens to obtain parallel rays on the Ray Table. Adjust the Cylindrical
Lens so its flat surface is perpendicular to the incident rays and so the central ray passes through the lens
undeflected.
➀ Measure F.L.
1
and F.L.
2
. (see Figure 13.1).
F.L.
1
= __________________________________.
F.L.
2
= __________________________________.
Remove the Parallel Ray Lens and Component Holder. Remove the Slit Mask from its Component Holder. Set
the Holder aside and replace the Slit Mask on the front of the Light Source. Move the Ray Table and Base close
enough to the Light Source so the filament of the Light Source is a distance f
1
from the curved side of the
Cylindrical Lens
➁ Describe the refracted rays.___________________________________________________.
➂ Turn the Cylindrical Lens around and place it on the Ray Table so that its straight side is a distance f
2
from the
filaments (you may need to move the Ray Table and Base closer to the Light Source).
Describe the refracted rays. __________________________________________________.
F.L.
2
f
2
Parallel Ray
Lens
f
1
F.L.
1