[Jewelry making - Article 00150] - Re: [Orchid] Setting - cone shaped hole

[Dave]

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Hi Hans,

>     And that leads me to this question, Is there a way one can work out
>     the critical angle from the refractive index of a given material?

    Here's the formula to calculate the Critical Angle (CA) when the
    Refractive Index (RI) of the stone is know. 

    r = the critical angle
    n = the RI
    since r = 1/n

    Example: RI or tourmaline is 1.63
    1 divide by 1.63 =0.6136
    0.6136 is the natural function (sine) of  37 deg 51 minutes.
    The CA or tourmaline is 37 deg 51'.

    The calculation can be done using a calculator with trigonometric
    functions or by looking up the sine value in a table of
    trigonometric functions. 

Dave

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