User's Manual

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Instruction Sheet

012-12360A

PASCO Optics

Adjustable Focal Length Lens

OS-8494

800-772-8700 www.pasco.com

*012-12360*

Included Equipment Quantity

1. Adjustable Focal Length Lens 2

2. Tubing, 5 mm O.D. 30 cm

3. 10 mL Syringe 1

Related Equipment

• Human Eye Model (OS-8477)

• Eye Model Bracket (OS-8469)

• Adjustable Lens Holder* (OS-8474

• Basic Optics Light Source* (OS-8470)

• Basic Optics Bench*, 60 cm (OS-8541)

• Basic Optics Viewing Screen* (OS-8460)

*Part of Basic Optics System, OS-8515A

See www.pasco.com for other PASCO Optics System equipment.

Introduction

The Adjustable Focal Length Lens includes two lenses, a

length of plastic tubing, and a 10 milliliter (mL) syringe. Each

lens consists of a plastic housing with two flexible membranes

held onto the housing with removable rings. Use the syringe to

fill the lens with a fluid such as water and to increase or

decrease the amount of fluid between the two flexible mem-

branes. By adjusting the curvature of the membranes, you can

adjust the focal length of the lens.

The Adjustable Focal Length Lens is designed to be used with

the PASCO Human Eye Model (OS-8477) to demonstrate

accomodation, the ability of the eye’s crystalline lens to change

its focal length. It can also be used with components of the

PASCO Basic Optics System (OS-8515A) such as the Light

Source, Optics Bench, Viewing Screen, and Adjustable Lens

Holder.

Summary of content (4 pages)

PAGE 1
Instruction Sheet 012-12360A ® *012-12360* PASCO Optics Adjustable Focal Length Lens OS-8494 2 3 1 Included Equipment Quantity Introduction 1. Adjustable Focal Length Lens 2 2. Tubing, 5 mm O.D. 30 cm 3. 10 mL Syringe 1 The Adjustable Focal Length Lens includes two lenses, a length of plastic tubing, and a 10 milliliter (mL) syringe. Each lens consists of a plastic housing with two flexible membranes held onto the housing with removable rings.
PAGE 2
Assembly and Maintenance Cut a length of tubing about 15 cm (6 inch) long. Adjust the syringe so that the piston is beyond the midpoint of the cylinder. Attach the piece of plastic tubing to the 10 mL syringe and the connector on the edge of the lens housing (see Figure 1). NOTE: Avoid touching the surface of the flexible membranes. If you need to clean the membrane’s surface, use a soft, lint-free cloth moistened with water.
PAGE 3
Use with the Human Eye Model Retina Viewing Screen Set the Basic Optics Light Source about 5 to 10 cm in front of the Human Eye Model with the “crossed-arrow” target aligned with the opening in the front of the model. Place the retina viewing screen in the “NORMAL” groove. Human Eye Model Make sure that the lens is filled with a fluid such as water. Place the Adjustable Focal Length Lens inside the Human Eye Model in the lens holder groove labeled “SEPTUM” (see Figure 3).
PAGE 4
Technical Support For assistance with any PASCO product, contact PASCO at: Address: PASCO scientific 10101 Foothills Blvd. Roseville, CA 95747-7100 Phone: 916-786-3800 (worldwide) 800-772-8700 (U.S.) Fax: (916) 786-7565 Web: www.pasco.com Email: support@pasco.com For the latest revision of this Instruction Sheet, visit: www.pasco.com/go?OS-8494 Limited Warranty For a description of the product warranty, see the PASCO catalog.