Four ideal linear sheet polarizers are stacked one behind

the other with the transmission axes of the first vertical, the

second at $30,$ the third at $60,$ and the fourth at $90.$ All

the angles are measured from the vertical. What fraction of

the incident unpolarized light emerges? Give your answer as

a decimal.

$33.$ A$0\mathrm{.}211$ B$0\mathrm{.}306$ C$0\mathrm{.}443$ D$0\mathrm{.}643$

E$0\mathrm{.}932$ F$1\mathrm{.}35$ G$1\mathrm{.}96$ H$2\mathrm{.}84$