Fresnel's double mirror experiment

Product No: P1195000


This double mirror experiment devised by Fresnel in 1816 is one of a number of experiments of historical significance which were performed in the 18th and 19th century to demonstrate the wave theory of light. Using two plane mirrors set at an angle to each other of almost 1800 ,two virtual light sources are created by reflection of a diverging beam of light from which two divergent light beams appear to emerge. These are coherent and can thus interfere.

The students should first familiarize themselves with the general set-up of the Fresnel experiment and describe the interference patterns. The angle of the two mirrors remains constant which simplifies the set-up.
In the second experiment, the wavelength of red light is to be determined. You have the Option of using the other colour filters to ascertain the wavelengths of further colours.


  1. Let a narrow beam of light shine onto a Fresnel double mirror and observe what happens.
  2. Determine the distance from the virtual Iight source and, using this and the interference pattern, find out the wavelength of red light.
Materiallist (Excerpt) Product Amount
PHYWE power supply DC: 0...12 V, 2 A / AC: 6 V, 12 V, 5 A 13505-93 1
Fresnel mirror on plate 08561-00 1
Light box, halogen 12V/20 W 09801-00 1
Slit, adjustable.up to 1 mm 11604-07 1
Support base, variable 02001-00 1
Measuring magnifier 09831-00 1
Plate mount f.3 objects 09830-00 2
Meter scale for optical bench 09800-00 1
Lens on slide mount, f=+300mm 09820-04 1
Lens on slide mount, f=+50mm 09820-01 1
Bottom with stem for light box 09802-10 1
Mount with scale on slide mount 09823-00 1
Screen, white, 150x150mm 09826-00 1
Slide mount for optical bench 09822-00 2
Color filter set,add.color mixt. 09807-00 1
Support rod, stainless steel, l = 600 mm, d = 10 mm 02037-00 2
Diaphragm holder, attachable 11604-09 1
Measuring tape, l = 2 m 09936-00 1

Title Product Language
TESS advanced Physik Handbuch Wellenoptik 01167-01 DEU
TESS advanced Physics manual Wave Optics 01167-02 ENG
TESS advanced Physique manual Optique des ondes 01167-03 FRA
TESS advanced Physik Ergänzunsset Optik 3, OE-3 15280-88

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