Re: [Phys-l] A geek's observations on "Avatar"

[Brian Whatcott <betwys1@sbcglobal.net>]

I wrestled with this concept.
I started from the idea that sunglass optics set out to reflect or absorb
UV and some visible.   To block 110% UV  then, is to (say) reflect all 
the incident
UV component, and in addition up convert some other incident component
to provide an enhanced reflected UV beam: from the visible and  IR I 
imagine.
ZBLAN glass, possibly.   Diamond impregnated plastic operates as a down 
converter,
unfortunately - else imagine the buzz cachet.

In this conception, anyone looking at these sunglasses from the outside,
takes an enhanced risk of retinal sunburn....

Brian W

chuck britton wrote:
> Bought a pair of real cheap sunglasses once - just because they were 
> labeled as blocking 110% of all UV.
>
> I couldn't figure out the 'magic' that might result from this.
>