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    Re: Clear side of horizon mirrors has reflecting properties.
    From: Bill Morris
    Date: 2020 Oct 15, 18:29 -0700

    One book, David, does mention it, on page 105 of "The Nautical Sextant", written, modestly, by me. For those who have not yet been wise enough to buy a copy, plain glass of refractive index of 1.55 at an angle of incidence of 10 to 15 degrees, typical of most sextants, reflects nearly 9 percent of the incident light.

    Bill Mrris

    Pukenui

    New Zealand

       
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