Laser with expanding lens, Soldering Gun
Microscope Slide Image
Microscope Slide Image

 

Code Number: 6D30.85

Demo Title: Interference - Microscope Slide and Soldering Gun

Condition: Good

Principle: Interference & Thermal Expansion

Area of Study: Optics

Equipment: 

Laser with expanding lens, microscope slide, soldering gun.

Procedure:

Reflect the expanded laser beam off of the microscope slide and onto the screen.  A readily visible interference pattern should be observed.  Heat the soldering gun and hold the tip to the back side of the slide.  The thermal expansion of the slide should change the interference pattern a great deal where the tip is touching the slide.

References:

  • Kevin T. Kilty, "A Simple Interferometer", TPT, Vol. 35, #8, Nov. 1997, p. 507.
  • T. Kallard, "Interference Demonstration with Plane Parallel Glass Plates", Exploring Laser Light, p. 117.
  • Gordon McComb,  Lasers, Ray Guns, & Light Cannons - Projects from the Wizard's Workbench, p. 154.