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Date: Sun, 29 Feb 2004 07:08:19 GMT
From: Malcolm William Mason <mwm1(delete)nospamedu>
Subject: Re: Re: Preventing/repairing dash cracks


On Tue, 24 Feb 2004 23:37:13 GMT, Bob <uctraingNOSPAMnospamanet.com> wrote: >On Tue, 24 Feb 2004 17:37:35 +0000, Grunff <grunffnospam.com> wrote: > >>It's actually very much the other way round. Deep blue light is ~400nm. >>Beyond that you're into near UV. Near UV does pass through glass with >>reasonably low absorption. The cutoff point for ordinary silica glass is >>around 350-320nm. Anything shorter than that is completely absorbed. Then how does one account for feeling warm next to a window on a sunny day? And why oes one never get a tan indoors? I understand that the UV is almost entirely absorbed and the IR goes blythley through in both directions and can be a consideable heatlosswith unshshaded windows inon dull winter days and at night. Malcolm

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