Re: 1.7 vs 1.53 refractive index in glasses ??
- From: Salmon Egg <salmonegg@xxxxxxxxxxxxx>
- Date: Sun, 25 Mar 2007 01:57:16 GMT
On 3/24/07 10:39 AM, in article 2_mdnVz2oZ3n_5jbnZ2dnUVZ_q-vnZ2d@xxxxxxx,
"Richard F.L.R.Snashall" <rflrs@xxxxxxxxxxxxx> wrote:
Salmon Egg wrote:
These days, with fancy materials such as rare earth glasses and who knows
what kind of plastics, the relationship between density and index can be
more obscure. Can anyone supply a link that will clarify these
relationships?
You don't need to go that far. For example, look at the difference
between the densities of Schott F2 (3.61) and Schott N-F2 (2.65).
My decades old Schott catalog did have F2 in it but I did have to Google
N-F2. The six digit numbers describing index and dispersion were the same
for the two glasses.
A little more reading indicated that the reformulation was to get rid of
arsenic and lead. That probably is why the density is lower. My guess is
that the inner electrons of the atoms forming the glass are tightly bound
and do not interact strongly with visible light. I do not plan to pursue the
matter much further.
In plastics, the index will be greatly affected by the kinds of bonds in the
polymer. Again, I do not plan to investigate how that affects the
relationship between density and index for common polymers. But if such
information is readily available, I am likely to read it.
Bill
-- Fermez le Bush--about two years to go.
.
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