Discussion
While watching three-dimensional pictures we need to wear
Answer: C
We need to wear Polaroid glass.
Many 3D films are projected as two overlapping images, one for each eye, in light polarised in two different directions. The viewer's glasses have polarising (Polaroid) filters set at matching angles, so each eye sees only its own image, and the brain combines the two slightly different views into a picture with depth.
A magnifying glass or convex lens only enlarges an image and cannot send different pictures to the two eyes, so it gives no 3D effect. Since Polaroid glasses are the answer, 'None of the above' is wrong.
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