Department of Physics and Astronomy

Dartmouth

Master Lab Schedule | Lab Staff | Support

Physical Optics

Physics Home > Teaching Labs > Optics > Physical Optics

People

Research

Academics

Monthly Calendar

Public Observing

Contact Information

Department News

Positions Open


Home

Site Map


Topics

Points of Emphasis

Prerequisites

Lab Activities

Spacer In this lab, the students experimentally confirm the validity of the following:

1. For diffraction from a single slit:

a. the space between adjacent minima on either side of the central maxima is given by the expression:

Dx = Ll/a

where L is the distance from the slit to the viewing screen, l is the wavelength of the light and a is the width of the slit; and

b. the intensity of the light in the diffraction pattern as a function of the angle q is given by the expression:

Iq = Imax[ (sin q)/q]2

where a = (p a q) / l .


2. For interference and diffraction from a double slit:

a. the location of the maxima are given by the expression:

x = (nlL)/d

where n is the number of the maxima, l is the wavelength of the light, L is the distance from the slit to the viewing screen and d is the slit spacing; and

b. the intensity of the light in the interference and diffraction pattern as a function of the angle q is given by the expression:

Iq = Imaxcos 2 b

where b = (p d q)/l .


3. For a multiple slit system:

a. the maxima and minima locations for the envelope are due to diffraction effects and are described mathematically by the appropriate equations above; and

b. the intensity of the light in the interference and diffraction pattern as a function of the angle q is given by the expression:

Iq = (Imax/N2) [(sin Nb)/sin b]2 [(sin a)/a]2

where N is the number of slits.



Some writeups include demonstations for the following:

Crossed polarizers
Brewster angle
Rotation of plane of polarization
Newton's fringes
Dispersion of light

Course Level

Introductory: P4, P14, P16

Student Handouts

Equipment

Number of set-ups available: 20

Per lab station:

1 30 V DC power supply/wooden stand
1 X-Y recorder/plotter pen and 10 ohm resister across Y inputs
1 HeNe laser/wooden stands
1 ring stand/metal platform
1 slit plate/holder
1 mounted photoresistor
1 2m meterstick
2 flat mirrors/optical bench mounts
1 slide with .005" wire mounted on it
2 wooden wedges
1 flashlight
1 T-ruler
1 banana lead
1 slit plate dimensions sheet taped to table

Apparatus

Demos 1-3: Crossed Polarizers, Brewsters Angle, Rotation of plane of Polarization

Apparatus
2 polarizers
1 holographic diffraction grating
1 bottle of corn syrup
1 800 ml beaker filled with water


Demo 4: Newton's Fringes

Apparatus
1 sodium lamp
1 thin glass slide


Demo 5: Dispersion of Light

Apparatus
1 plastic square container filled with water
1 flashlight
coffee creamer
Apparatus

Notes


Last Update:

Site contact: largent@Dartmouth.EDU

Top     Physics Home     Lecture/Demo     Site Map