Question

When the pass-axes are aligned at \[\theta=0^\circ\], what is the transmitted intensity?

Options

• \[I=I_0\], the maximum intensity

• \[I=I_0/2\], half intensity

• \[I=0\], complete darkness

• \[I=I_0/4\]

Answer 1

At \[\theta=0^\circ\], \[\cos\theta=1\]. Malus' Law gives \[I=I_0\]; aligned, parallel pass-axes transmit the maximum intensity.