Pasco OS-8529 SLIT ACCESSORY Bedienungsanleitung PDF herunterladen (Seite 7)

012–06348A Slit Accessory

Purpose

The purpose of this experiment is to examine the diffraction pattern formed by laser light

passing through a single slit and verify that the positions of the minima in the diffraction

pattern match the positions predicted by theory.

Theory

When diffraction of light occurs as it passes through

a slit, the angle to the minima in the diffraction

pattern is given by

where a is the slit width,

is the angle from the

center of the pattern to the m

minimum,

is the

wavelength of the light, and m is the order (1 for

the first minimum, 2 for the second minimum, .

. . counting from the center out). See Figure 1.1.

Since the angles are usually small, it can be

assumed that

From trigonometry,

where y is the distance on the screen from the

center of the pattern to the m

minimum and D is

the distance from the slit to the screen as shown in

Figure 1.1. The diffraction equation can thus be

solved for the slit width:

a =

(m =1,2,3,…)

sin

≈ tan

tan

a sin

= m

(m =1,2,3,…)

Materials required:

• optics bench

• white projection surface

• Diode Laser (OS-8528) • metric rule

• Single Slit Set (OS-8529) • page 2 of the Slit Accessory manual

From the Introductory or Advanced Optics System (OS-8500 or OS-9254A)

Experiment 1: Diffraction from a Single Slit

slit

screen

Figure 1.1: Single Slit Diffraction Pattern

m = 2

m = 1

m = 2

m = 1

1 2 3 4 5 6 7 8 9 10 11 12 13 14

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