Given a scientific passage and an answer, generate a question for the given answer.
Q: Passage: Polarized filters block 50% of unpolarized light. If two filters are oriented so that their polarization axes are aligned, how much light is transmitted? What about if their axes are oriented perpendicular to each other? Draw two diagrams below to support your answers. Answer: 50%
A:
How much unpolarized light does a polarized filter block?