BEST45CAL
06-02-2007, 09:06 AM
Smoke and mirrors
A simple optical effect underlies both shadowgraphy and schlieren imaging: Light rays bend, or refract, at the boundaries between air masses of different densities. The same phenomenon causes the twinkle of stars and the distorted appearance of objects on the far side of a patch of hot pavement.http://prs-sun-107-nyeh-peshr-hme0-39.digisle.net/science/science_news/articles/images/revealing_covert_actions_02.jpg
Science News Online (http://prs-sun-107-nyeh-peshr-hme0-39.digisle.net/science/science_news/articles/revealing_covert_actions.html)
A simple optical effect underlies both shadowgraphy and schlieren imaging: Light rays bend, or refract, at the boundaries between air masses of different densities. The same phenomenon causes the twinkle of stars and the distorted appearance of objects on the far side of a patch of hot pavement.http://prs-sun-107-nyeh-peshr-hme0-39.digisle.net/science/science_news/articles/images/revealing_covert_actions_02.jpg
Science News Online (http://prs-sun-107-nyeh-peshr-hme0-39.digisle.net/science/science_news/articles/revealing_covert_actions.html)