Pasco OS-8529 SLIT ACCESSORY Bedienungsanleitung PDF herunterladen (Seite 11)

012–06348A Slit Accessory

Figure 3.2: Interference Fringes

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, θ is the angle from the center

of the pattern to the m

minimum, λ 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 3.1.

When light passes through two slits, the two light

rays emerging from the slits interfere with each other

and produce interference fringes. The angle to the

maxima (bright fringes) in the interference pattern is

given by

where d is the slit separation, θ is the angle from the

center of the pattern to the m

maximum,

is the

wavelength of the light, and m is the order (0 for the

central maximum, 1 for the first side maximum, 2 for

the second side maximum, . . . counting from the

center out). See Figure 3.2.

Experiment 3: Comparisons of Diffraction and Interference Patterns

The purpose of this experiment is to compare the diffraction and interference patterns formed

by laser light passing through various combinations of slits.

a sin

= mλ

(m = 1, 2, 3 . . .)

d sin

= mλ

(m = 0, 1, 2, 3 . . .)

m = 2

m = 1

m = 2

m = 1

slit

screen

Figure 3.1: Single Slit Diffraction Pattern

screen

slit

diffraction envelope

m = 0

m = 5

m = 1

m = 2

m = 3

m = 4

Materials required:

• optics bench

• white projection surface

• Diode Laser (OS-8528) • metric rule

• Single Slit and Multiple Slit Sets (OS-8529) • page 2 of the Slit Accessory manual

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

Purpose

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Pasco OS-8529 SLIT ACCESSORY Bedienungsanleitung Seite 11

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