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Physics/One way surfaces

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Question
http://www.amazon.com/Mirror-Window-Film-Wide-Roll/dp/B004S7HPJ0

Do you know if they make any one way surfaces in which if there is more light on the outside it becomes opaque instead of like a mirror?

Answer
Depends on how fast you want them becoming opaque.  There are switchable mirror windows based on liquid crystal technology that could be tracked to a light sensor.  They're expensive.  There's also darkening self-adjusting tinted material they make glasses from.  It's also somewhat expensive.  So yes, it exists.  I know of no cheap and easy material like a simple film to do this job, however, since most ideas for anything like that would be temperature-dependent in their performance at least.  

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Dr. Stephen O. Nelson

Expertise

I can answer most basic physics questions, physics questions about science fiction and everyday observations of physics, etc. I'm also usually good for science fair advice (I'm the regional science fair director). I do not answer homework problems. I will occasionally point out where a homework solution went wrong, though. I'm usually good at explaining odd observations that seem counterintuitive, energy science, nuclear physics, nuclear astrophysics, and alternative theories of physics are my specialties.

Experience

I was a physics professor at the University of Texas of the Permian Basin, research in nuclear technology and nuclear astrophysics. My travelling science show saw over 20,000 students of all ages. I taught physics, nuclear chemistry, radiation safety, vacuum technology, and answer tons of questions as I tour schools encouraging students to consider careers in science. I moved on to a non-academic job with more research just recently.

Education/Credentials
Ph. D. from Duke University in physics, research in nuclear astrophysics reactions, gamma-ray astronomy technology, and advanced nuclear reactors.

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