increase in yield fig2 b illustrates a top view of the optical cell 100 in accordance with at least some embodiments described herein fig2 b illustrates the second compensator 130 being rotated about the first axis 132 the physical length of the second optical path 163 through the second compensator 130 in a non rotated state is illustrated by line 280 the non rotated state of the second compensator 130 as illustrated in fig2 a is presented by the dashed box and presents a rotation state of the second compensator 130 with the shortest physical path through the second compensator 130 the physical length of the second optical path 163 through the second compensator 130 in a rotated state as illustrated in fig2 b is illustrated by line 282 line 282 is longer than line 280 because the physical length of the second optical path 163 through the second compensator 130 increases when the second compensator 130 is rotated to the position depicted in fig2 b in the illustrated embodiment rotating the second compensator 130 does not increase the total physical length of the second optical path 163 the total physical length of the second optical path 163 remains constant when the second.