ML Archiv: Re: [OM] Mind Bender (intermediate focal length?)

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Re: [OM] Mind Bender (intermediate focal length?)

from Joe Gwinn

Subject:	Re: [OM] Mind Bender (intermediate focal length?)
From:	Joe Gwinn <joegwinn@xxxxxxxxx>
Date:	Mon, 25 Nov 2002 09:25:53 -0500

At 12:35 AM +0000 11/25/02, olympus-digest wrote:
>Date: Sat, 23 Nov 2002 21:09:40 -0800 (PST)
>From: AG Schnozz <agschnozz@xxxxxxxxx>
>Subject: [OM] Mind Bender
>
>Quiz:
>
>What focal length is effectively half-way between 100mm and
>200mm?

140 mm.  Computed as the geometric mean of 100 and 200 mm:  Sqrt[100*200]= 
141.4 mm.

Joe Gwinn


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