Re: [Phys-l] glass

[ludwik kowalski <kowalskil@mail.montclair.edu>]

http://en.wikipedia.org/wiki/Fused_quartz

Ludwik
=========================

On May 9, 2011, at 8:37 PM, Anthony Lapinski wrote:

> I am teaching about refraction, and gave out a table of refractive
> indexes. A student asked about two of the entries:
>
> fused quartz	1.458
> crown glass		1.523
>
> She wanted to know what the difference was. I wasn't exactly sure,  
> but I
> believe that crown glass is "clear" and used for eyeglasses, while  
> fused
> quartz has a greenish tint due to impurities. Is this true? I thought
> crown glass was more "pure" and thus clearer. Not sure what fused  
> quartz
> is used for.
>
> Can anybody help with this?
>
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=======================================================================
Ludwik Kowalski (see Wikipedia), interviewed at:

http://pages.csam.montclair.edu/~kowalski/interview1.html

is the author of two FREE ON-LINE books:  http://csam.montclair.edu/~kowalski/links.html