OXP-07 Diffraction of Light

Topics

Huygens Principle
Single and Multiple Slits
Diffraction of White Light
Diffraction at a Wire
Babinet Theorem
Diffraction of Monochromatic Light


Examples of Investigation and Measurement

Diffraction at single slits
In a first measurement the collimated beam of a laser is applied to single slits. The diffraction pattern as a function of the slit width is investigated and its angular distribution is measured with a photo detector.

Diffraction at multiple slits
For further investigations double slits and multiple slits with various widths and spacing are provided. Interference of diffracted waves is observed and diffraction laws are verified. As an extension to a mask with an infinite number of slits a diffraction grating is used.

Babinet theorem
The use of a thin wire shows the same diffraction pattern as a slit with a width corresponding to the thickness of the wire. Through this principle the thickness of the provided wires or of the hair of a student can be determined.

 
 


Required Equipment

Cat. No.     Qty.     Description
02.0200      1        Profile rail, 200 mm
02.0300      1        Profile rail, 300 mm
02.1022      1        Screen holder, carrier 25
02.1602      1        Optical screen, 80x65, scale
02.2126      2        Mounting plate, click 25, carrier 20
02.2528      1        Click mount 25, 0.5 mm aperture
02.6106      1        Adjustment holder, 4 axes, carrier 20
04.0061      1        Plano convex lens f=40 mm, 22.4, click 25
05.0030      1        High brightness LED lamp, white
05.0226      1        DIMO 532 (green)
07.0010      1        BNC - banana adapter connection leads 2x4 mm plugs
07.0102      1        Photodetector, Si PIN, in housing
07.0206      1        Active power supply LDD-05
09.1710      1        Optical slit plate assembly
09.1746      1        Beam expander magnification 6x
19.0400      1        Digital multimeter 3 ½ digits