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    Re: Floating mirror
    From: Brad Morris
    Date: 2015 Apr 20, 19:04 -0400

    Absolutely agreed Alex.  My original estimate was 4 rotations and observations.

    For the purposes of illustration, I suggested just 2, making the averaging easier to see. 

    My initial assessment was that the floating mirror was a bad approach.  So called 'common knowledge'.  But once Greg pointed out the averaging trick (his point 4), it became obvious that 'common knowledge' was wrong (me included!)

    Brad

    On Apr 20, 2015 6:52 PM, "Alexandre Eremenko" <NoReply_Eremenko@fer3.com> wrote:

    Brad,
    You wrote:
    
    >Assume the mirror has a pitch forward of 5 deg, but only in that angle, side
    >to side is perfect.
    
    I'm afraid you cannot assume that "side to side is perfect".
    Thus I think you need 4 rotations to average:-)
    
    Alex.
    
    

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