A study of photochromism and the properties of photochromic glass. (South Carolina Academy of Sciences Abstracts).
Photochromic glass darkens when exposed to sunlight and lightens
when removed from sunlight. It is often used for prescription
eyeglasses, because it can serve as both outdoor sunglasses and indoor
reading glasses, thereby eliminating the need for obtaining two separate
sets of eyewear. In the present study, the properties of photochromism were studied. The rate at which photochromic glass darkens was measured.
The rate at which the glass recovers was also monitored. In addition,
the effects of light intensity and wavelength of the darkening rate were
studied. The mechanism by which photochromism operates will be discussed
and the results of these experiments will be presented.
Robert Klauck, R. Seth Smith
Department of Physics and Astronomy
Francis Marion University