PASCO OS-8523 User Manual
Instruction Manual and
Experiment Guide for
the PASCO scientific
Model OS-8523
SLIT ACCESSORY
FOR THE BASIC OPTICS SYSTEM
012-05880D
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MULTIPLE SLIT SET
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SLIT ACCESSO
BASIC OPTICS
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012-05880D Slit Accessory
Table of Contents
Section Page
Copyright, Warranty, and Equipment Return.....................................................ii
Introduction ......................................................................................................1
Equipment ........................................................................................................2
Assembly..........................................................................................................3
Experiments
Exp. 1: Diffraction from a Single Slit ..........................................................5
Exp. 2: Interference from a Double Slit ....................................................... 9
Exp. 3: Comparisons of Diffraction and Interference Patterns .....................13
Technical Support ......................................................................... Inside Back Cover
®
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012-05880D Slit Accessory
Copyright, W arranty and Equipment Return
Please—Feel free to duplicate this
manual subject to the copyright restrictions below.
Copyright Notice
The PASCO scientific Model OS-8523 Slit Accessory
manual is copyrighted and all rights reserved. However, permission is granted to non-profit educational
institutions for reproduction of any part of the Slit
Accessory manual providing the reproductions are
used only for their laboratories and are not sold for
profit. Reproduction under any other circumstances,
without the written consent of PASCO scientific, is
prohibited.
Limited Warranty
PASCO scientific warrants the product to be free from
defects in materials and workmanship for a period of
one year from the date of shipment to the customer.
PASCO will repair or replace, at its option, any part of
the product which is deemed to be defective in
material or
workmanship. The warranty does not cover damage
to the product caused by abuse or improper use.
Determination of whether a product failure is the
result of a manufacturing defect or improper use by
the customer shall be made solely by PASCO scientific.
Responsibility for the return of equipment for warranty repair belongs to the customer. Equipment must
be properly packed to prevent damage and shipped
postage or freight prepaid. (Damage caused by
improper packing of the equipment for return shipment will not be covered by the warranty.) Shipping
costs for returning the equipment after repair will be
paid by PASCO scientific.
Equipment Return
Should the product have to be returned to PASCO
scientific any reason notify, PASCO scientific by
letter or phone BEFORE returning the product. Upon
notification, the return authorization and shipping
instructions will be promptly issued.
NOTE:
NO EQUIPMENT WILL BE ACCEPTED FOR
RETURN WITHOUT AN AUTHORIZATION.
When returning equipment for repair, the units must
be packed properly. Carriers will not accept responsibility for damage caused by improper packing. To be
certain the unit will not be damaged in shipment,
observe the following rules:
➀ The shipping carton must be strong enough for the
item shipped.
➁ Make certain there are at least two inches of pack-
ing material between any point on the apparatus
and the inside walls of the carton.
➂ Make certain that the packing material can not shift
in the box, or become compressed, allowing the
instrument come in contact with the edge of the
shipping carton.
Address: PASCO scientific
10101 Foothills Blvd.
P.O. Box 619011
Roseville, CA 95678-9011
Credits
Authors: Ann & Jon Hanks
Editor: Sunny Bishop
®
Phone: (916) 786-3800
FAX: (916) 786-8905
email: techsupp@PASCO.com
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012-05880D Slit Accessory
Introduction
The PASCO OS-8523 Slit Accessory is used with the
PASCO OS-8525 Laser Diode on the optics bench in the
PASCO OS-8515 Basic Optics System. This set of two
disks has many different types of slits for diffraction and
interference experiments. The special comparison
patterns have two different slits spaced close enough
together so they can both be illuminated by a single laser
beam at the same time. This allows the student to
compare the two different patterns side-by-side so they can
see their similarities and differences.
OS-8523 Slit Accessory specifications:
The contents of the Single Slit Disk are: (See Figure 1)
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OS-8523
SINGLE SLIT SET
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BASIC OPTICS
SLIT ACCESSORY
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Figure 1: Single Slit Disk
– 4 single slits (slit widths 0.02, 0.04, 0.08, 0.16 mm)
– 1 variable slit (slit width varies from 0.02 to 0.20
mm)
– 1 square pattern
NOTE: Due to limitations of the photographic process used to produce the slit film, the line and slit
may not be exactly the same width.
The contents of the Multiple Slit Disk are: (See Figure 2)
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BASIC OPTICS
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Figure 2: Multiple Slit Disk
– 4 double slits (slit width/separation in mm: 0.04/
0.25, 0.04/0.50, 0.08/0.25, 0.08/0.50)
– 1 variable double slit (slit separation varies from
0.125 to 0.75 mm with constant slit width 0.04
mm)
– 4 comparisons: single/double slit with same slit
width (0.04 mm)
– 1 hexagonal pattern
– 1 random opaque dot pattern (dot diameter = 0.06
mm)
– 1 random hole pattern (hole diameter = 0.06 mm)
– 1 opaque line of width 0.08 mm
– 1 slit/line comparison, line and slit have similar width
(0.04 mm)
– 2 circular apertures (diameters 0.2 mm and 0.4
mm)
®
– double/double slit with same slit width (0.04
mm), different separation (0.25 mm/0.50 mm)
– double/double slit with different slit widths (0.04,
0.08 mm), same separation (0.25 mm)
– double/triple slit with same slit width (0.04 mm),
same separation (0.125 mm)
– set of 4 multiple slits (2, 3, 4, 5 slits) with same
slit width (0.04 mm), same separation (0.125
mm)
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Slit Accessory 012-05880D
Equipment
lens holder with
thumbscrew (2)
Single Slit Disk
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OS-8523 Slit Accessory Equipment
The OS-8523 Slit Accessory includes the following:
– Single Slit Disk
– Multiple Slit Disk
– lens holder with thumbscrew (2)
Multiple Slit Disk
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012-05880D Slit Accessory
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Assembly
slit disk
ring
thumbscrew
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lens holder
mounted slit
accessory
optics bench
OS-8525
Diode Laser
adjusting
screws
input jack
(9VDC)
Figure 3: Slit Accessory and Lens Holder
Mounting the Slit Accessory to the Optics
Bench
Each of the slit disks is mounted on a ring which snaps
into an empty lens holder. The ring should be rotated in
the lens holder so the slits at the center of the ring are
vertical in the holder. See Figure 3. Tighten the thumbscrew on the holder so the ring cannot rotate during use.
To select the desired slits, rotate the disk until it clicks
into place with the desired slits at the center of the holder.
NOTE: All slits are vertical EXCEPT the
comparison slits which are horizontal. The comparison slits are purposely horizontal because
the wide laser diode beam will cover both slits to
be compared. If you try to rotate these slits to the
vertical position, the laser beam may not be
large enough to illuminate both slits at the same
time.
To align the laser beam and the slits, place the Diode
Laser (OS-8525) at one end of the bench. Place the slit
holder on the optics bench a few centimeters from the
laser with the disk-side of the holder closest to the laser. See Figure 3. Plug in the Diode Laser and turn it on.
Adjust the position of the laser beam from left-to-right
Figure 4: Using the Slit Accessory
with the Diode Laser
and up-and-down until the beam is centered on the slit.
Once this position is set, it is not necessary to make any
further adjustments of the laser beam when viewing any
of the slits on the disk. When you rotate the disk to a new
slit, the laser beam will be already aligned. The slits click
into place so you can easily change from one slit to the
next, even in the dark.
®
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