An unpolarized light bulb is dimmed by a stack of three polarizing filters. The middle filter is rotated 21.6 ∘ from the first filter, and the final filter is rotated 56.8 ∘ from the first filter. A light intensity of 71.5 W/cm2 exits from the stack of all three filters.
The intensity can be increased and decreased by rotating the middle filter to other angles. What is maximum light intensity that can be obtained?
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