From: RichA <rander3128@gmail.com>
Subject: Re: People Keep Walking Into Glass at Apple Park
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Date: Wed, 21 Feb 2018 08:43:44 -0800 (PST)
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Subject: Re: People Keep Walking Into Glass at Apple Park
From: RichA <rander3128@gmail.com>
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On Tuesday, 20 February 2018 12:43:51 UTC-5, nospam  wrote:
> In article<1a18a948-6a7f-465d-930d-1bb8f0d6bceb@googlegroups.com>,
> RichA<rander3128@gmail.com> wrote:
> 
> > "Quite hard to see?"  Maybe if you're stoned all the time.  Glass reflects 4%
> > at each surface (perpendicular rays) and a lot more at glancing angles. 
> > Hard not to actually see it.
> 
> nowhere near 4%.
> 
> if that were the case, a camera lens with multiple surfaces would be
> nearly opaque.

96% uncoated, 98.5% single-layer magnesium-fluoride coated, 99% or so with multicoatings.  Old
cameras lens could (through reflection and internal absorption cut out 40-50% of the incoming light.
Please feel free to educate yourself further.