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A beam of vertically polarized light impinges onto two consecutive polarisers, the first with its transmission...

A beam of vertically polarized light impinges onto two consecutive polarisers, the first with its transmission axis tilted by 20 degrees compared to the horizontal and the second with its transmission axis parallel to the vertical. What is the percentage of light intensity escaping? Does this percentage change if the two polarisers are swapped?

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