Pasco OS-8500 INTRODUCTORY OPTICS SYSTEM Manuel d'utilisateur télécharger pdf (Page 49)

012-02744K Introductory Optics System

Experiment 19: The Projector

EQUIPMENT NEEDED:

-Optics Bench -Light Source

-75 mm Focal Length Convex Lens -150 mm Focal Length Convex Lens

-Variable Aperture -Crossed Arrow Target

-Viewing Screen -Component Holders (3).

Figure 19.1 Equipment Setup

Introduction

When an object is located between the focal point (f) and twice the focal point (2f) of a converging lens,

a real, inverted, magnified image is formed as shown in the diagram of Figure 19.1. If a viewing screen

is placed at the location of the image, the image will be focused onto the screen. In this case the lens

functions as a projector.

Procedure

Set up a projector as shown in Figure 19.1. Try both the 75 and 150 mm converging lenses.

➀ What happens to the image if d

is less than f? Can the image still be focused onto the Viewing Screen?

Why or why not? _______________________________________________________

_____________________________________________________________________________.

➁ What happens to the image if d

is greater than 2f? Can the image now be focused onto the Viewing

Screen? Why or why not? ____________________________________________________

_____________________________________________________________________________.

➂ Are there practical limits to the degree of magnification of the image? If so, what are they?

_____________________________________________________________________________.

Is it possible, using a single lens, to project an image that is uninverted? ___________________

_____________________________________________________________________________.

➃ Can the image formed by a projector be viewed without using a viewing screen? If so, where must the

observer be? _______________________________________________________________

_____________________________________________________________________________.

Viewing Screen

Variable Aperture

Crossed Arrow Target

75 mm Lens

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Pasco OS-8500 INTRODUCTORY OPTICS SYSTEM Manuel d'utilisateur Page 49