posted by Kiana .
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?
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