|
Astronomy Picture of the Day, Dec. 3, 2012., A Quadruple Lunar Halo Over Spain, Image Credit & Copyright: Dani Caxete |
Code Number: 6F40.80
Demo Title: Scattering - Fogged Glass - Halos
Condition: Excellent
Principle: Scattered Interference
Area of Study: Optics, Astronomy
Equipment:
Laser, Screen with hole, dust, mounted regular mirror (not a front surface mirror).
Procedure:
Breath on the glass plate or microscope slide to "fog" it up. Look throught the fog at the Maglite point source or some other distant light and observe the rainbow type rings around the point of light. Observe that these rings may only be visible for a short time as the fog evaporates.
References:
- Su Jin Moon, Hoon Yu, Jung Bog Kim, "Observation of Optical Corona Through Water Droplets in Class", TPT, Vol. 62, #5, May 2024, p. 397.
- "Photo of the Month, 'Fire Rainbow'", TPT, Vol. 44, #6, Sept. 2006, p. 391.
- Thomas T. Amy, "Demonstrating Atmospheric Diffraction Rings with a Tensor Lamp", AJP, Vol. 55, #1, Jan. 1987, p. 87.
- E. Hecht, "Random Multiple Aperture Diffraction", AJP, Vol. 41, #5, May 1973, p. 714.
- Robert Ehrlich, "Q.15, Diffraction of Rings Through a Mist", Turn the World Inside Out, p. 206.
- Jearl Walker, "6.110, Colored Rings from a Misty or Dusty Mirror", The Flying Circus of Physics Ed. 2, p. 287.
- Jearl Walker, "6.48, Frosty Glass Corona", The Flying Circus of Physics Ed. 2, p. 261.
- N. James Bridge, "A Novel Effect of Scattered-Light Interference in Misted Mirrors", Physics Education, July 2005, p. 359.
- Editors of Portable Press, "Who's the Rarest of Them All", Strange Science, p. 367.