Light is incident from water onto a flat transparent slab of material, at an angle of 48.8° with the normal. The reflected ray and the refracted ray are perpendicular to each other.
What is the index of refraction of the transparent substance?

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  1. The index of water is 1.33.

    That happens to be the Brewster angle in this case, since the reflected and refracted rays are perendicular.

    tan48.8 = n2/n1 = n2/1.33
    n2 = 1.52

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