Peter Todd wrote: > Now I am correct in saying that refractive > indices don't apply for solid objects right? Refraction is a property of any transparent substance, whether solid or not. Glass, water, and air all refract light and this can be easily observed with bare eyes and no special equipment. ****************************************************************** Embed Inc, Littleton Massachusetts, (978) 742-9014. #1 PIC consultant in 2004 program year. http://www.embedinc.com/products -- http://www.piclist.com PIC/SX FAQ & list archive View/change your membership options at http://mailman.mit.edu/mailman/listinfo/piclist