Unpolarized light passes through three polarizing filters. the first filter has its transmission axis parallel to the z direction, the second has its transmission axis at an angle of 30.0° from the z direction, and the third has its transmission axis at an angle of 60.0° from the z direction. if the light that emerges from the third filter has an intensity of 978.0 w/m2, what is the original intensity of the light? (assume both angles are measured in the same direction from the +z axis.)

To solve this problem it is necessary to apply the concepts related to the Law of Malus for which it is understood that

Where

indicates the intensity of the light before passing through the polarizer,

I is the resulting intensity, and

indicates the angle between the axis of the analyzer and the polarization axis of the incident light.

The intensity of light after passing through a series of three polarisers would be given as

Here,

Therefore

Therefore the original intensity of light was

insects!

explanation: