On 26 Feb 2004 at 19:26, Herb Chong wrote: > you shine a polarized light up through the crystal. you place another > polarizer between the crystal and the camera lens. best effects are when the > polarizers are crossed and the background is very dark.
This method also is used to make visible stresses in transparent materials. http://osa.creol.ucf.edu/activities/birefringence.pdf Rob Studdert HURSTVILLE AUSTRALIA Tel +61-2-9554-4110 UTC(GMT) +10 Hours [EMAIL PROTECTED] http://members.ozemail.com.au/~distudio/publications/ Pentax user since 1986, PDMLer since 1998
