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7 April, 13:36

What is the critical angle for light traveling inside the rod?

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  1. 7 April, 13:40
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    You need to use snell’s law in this problem. N1sin (theta) = n2sim (theta)

    N1 = index of oil

    N2 = index of glass

    If you already have the numbers, include it in this equation:

    N1. sin (90deg) = N2. sin (critical angle) (note sine (90deg) = 1)
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