Light passes readily through a pair of Polaroids when their axes are
1) parallel.
2) perpendicular.
3) neither of these,
and for a pair of Polaroids with axes at 45 degrees to each other
4) light will not pass.
5) light that passes is dimmer than for parallel Polaroids.
6) another Polaroid is necessary for any light to pass.
Answer: 1, 5
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