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    Re: Perpendicularity
    From: Herbert Prinz
    Date: 2004 Oct 12, 17:39 -0400

    Cliff Sojourner wrote:
    
    > is there any effect from index of refraction of the glass in
    > front of the silvered surface?
    >
    
    Only in so far as the refraction of the glass shifts the apparent reflective surface from the
    back towards the front surface of the mirror.  The sextant designer could compensate this by
    setting the mirror a little back.
    
    Herbert Prinz
    
    
    

       
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