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2 June, 13:04

The critical angle for a light ray travelling from a ruby into ethyl alcohol is 50.6 degrees celsius. Determine the index of refraction for ethyl alcohol.

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  1. 2 June, 15:29
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    In order to answer this question, I realized that I needed to know the index

    of refraction for ruby, so I went and looked it up. It's 1.762 to 1.770.

    I started trying to remember how to use this number and the critical angle

    to find the index of refraction of the other medium. That's when I saw the

    absurd unit "degrees celsius" for the critical angle, and I got discouraged.

    But I perked up very quickly, when I realized that I'm still on the "index of

    refraction" list, and while I'm there, I might as well just go ahead and

    look up ethyl alcohol too.

    It's 1.36.
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