In a Laboratory Experiment,you Are Given Two Unknown Substances and a Laser.One

Multiple Choice

In a laboratory experiment,you are given two unknown substances and a laser.One of the substances is a liquid in which you place the laser.The other is a tank made of a transparent solid.You aim the laser downward at the tank bottom - and find that the reflected ray is fully polarized when the angle of incidence is 54 $^{\circ}$ .What is the transmitted angle for the ray transmitted into the tank bottom?

A) 39 $^{\circ}$
B) 47 $^{\circ}$
C) can't answer this without knowing the indices of refraction.
D) 36 $^{\circ}$