Answer:
B. The light waves are completely blocked.
Explanation:
The intensity of the light coming out after two polarizers is given by Malus' Law:
[tex]I=I_0 cos^2 \theta[/tex]
where
[tex]I_0[/tex] is the initial intensity of light before the polarizers
[tex]I[/tex] is the intensity of light after the two polarizers
[tex]\theta[/tex] 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
[tex]\theta=90^{\circ}[/tex]
Therefore, the cosine factor is zero:
[tex]cos 90^{\circ} = 0[/tex]
And this means that the intensity of light after the two polarizers is also zero:
[tex]I=I_0 cos^2 90^{\circ} = I_0 \cdot 0 = 0[/tex]
So, the correct option is
B. The light waves are completely blocked.