As shown in the figure, a ray \( AB \) of unpolarized light enters from water of refractive index \( n_w = \frac{4}{3} \) into a medium of refractive index \( n_p = \frac{4}{\sqrt{3}} \) after passing through a glass plate of refractive index \( n_g = 1.5 \) and a layer of water. At a particular incident angle \( i \) the reflected ray \( CD \) is polarized in the direction as shown in the figure. The value of \( i \) (in degrees) is ________.
