Two linear polarizers are oriented at 60° to each other and beam of light is incident on them?

Question

By how much intensity of the light that passes through will change if third polarizer is inserted between them at angles 30° to both polarizers.

Answer 1

assuming the incident beam is unpolarised...

i got about 28%

I * 1/2 *cos^2 30 *cos^2 30

sounds about right, but it's been ages since i did that so you might want to check :)

also the wording of the question is odd...