Spectacles used for viewing 3-Dimensional films have :

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convex lens.

polaroids.

concave lens.

bifocal lens.

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This question was previously asked in

UPSC CAPF – 2010

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Spectacles used for viewing 3-Dimensional films often use polaroids (polarizing filters).

– One common method for displaying 3D films uses polarized light. Two images are projected simultaneously, each polarized differently (e.g., linearly polarized at 90 degrees to each other, or circularly polarized in opposite directions).
– The 3D glasses contain polarizing filters (polaroids) that match the polarization of the projected images. The filter over the left eye allows only the image intended for the left eye to pass through, and the filter over the right eye allows only the image intended for the right eye.
– The brain then combines these two slightly different images to create the perception of depth.

Older 3D systems used colored filters (anaglyph glasses, typically red and cyan). Modern active 3D systems use glasses with electronic shutters (LCD lenses) that rapidly open and close in sync with the display showing alternating images for the left and right eyes. The question likely refers to passive polarization glasses commonly used in cinemas or with some 3D TVs.

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