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Index > Heap > Reflection properties of a mirror?

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DarkAlchemist



Joined: 08 Oct 2010
Posts: 108
DarkAlchemist
I wonder if anyone knows if we reflect the sun via a mirror are there any pieces of the spectrum that are not reflected?
Post 12 Nov 2010, 18:04
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mindcooler



Joined: 01 Dec 2009
Posts: 423
Location: Västerås, Sweden
mindcooler
I reckon the reflectivity attenuates with higher frequencies, but what do I know? Smile
Post 12 Nov 2010, 19:04
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MHajduk



Joined: 30 Mar 2006
Posts: 6034
Location: Poland
MHajduk
mindcooler wrote:
I reckon the reflectivity attenuates with higher frequencies, but what do I know? Smile
It's a well known fact that the window glass absorbs UV light (so you can't tan sunbathing through the closed window Wink), but, from the other hand, special kinds of glass (like a quartz glass) are transparent for UV and used in UV lamps. So, the answer to the DarkAlchemist's question is "yes" if the mirror is made on the base of the "usual" glass. Smile
Post 12 Nov 2010, 20:33
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DarkAlchemist



Joined: 08 Oct 2010
Posts: 108
DarkAlchemist
Does anyone know which frequencies are attenuated using both types of glass? I figure it would be in a notch filter fashion but what about those mirrors used in reflecting telescopes?
Post 13 Nov 2010, 08:57
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JohnFound



Joined: 16 Jun 2003
Posts: 3500
Location: Bulgaria
JohnFound
In the telescope mirrors, the glass is behind the reflective layer (usually Al) and have nothing to do with the reflection.
Post 13 Nov 2010, 09:17
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bitRAKE



Joined: 21 Jul 2003
Posts: 2915
Location: [RSP+8*5]
bitRAKE
Yeah, they are called First (or Primary) Surface Mirrors - the glass or other backing material is not involved in reflection/refraction.

8.6 Principles of Reflection and Refraction
(Spectrum graph further down page - notice how Al works well at high frequencies.)
Post 14 Nov 2010, 04:06
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DarkAlchemist



Joined: 08 Oct 2010
Posts: 108
DarkAlchemist
A lot of the pictures are missing for me on that page. Sad

JohnFound wrote:
In the telescope mirrors, the glass is behind the reflective layer (usually Al) and have nothing to do with the reflection.
This would explain why they have to be resurfaced about every 5 years under normal, non vacuum, usage.

On a standard glass in front of the reflective material (common household mirror for instance) are any of the sun's frequencies attenuated at all?
Post 14 Nov 2010, 12:46
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