Answer:
B.
The light waves are completely blocked.
Explanation:
The intensity of the light coming out after two polarizers is given by Malus' Law:
where
is the initial intensity of light before the polarizers
is the intensity of light after the two polarizers
is the angle between the axes of the two polarizers
In this problem, we have two polarizers with their axes placed perpendicular to each other: this means that the angle is 90 degrees
Therefore, the cosine factor is zero:
And this means that the intensity of light after the two polarizers is also zero:
So, the correct option is
B. The light waves are completely blocked.