I want to manufacture a light proof enclosure. I need to understand: if I design a cap with a "U" section profile edge and the body with "T" or "U" section profile edge, will light be able to get inside or is this solution insufficient?
closed as off-topic by Aaron Stevens, John Rennie, stafusa, Jon Custer, ZeroTheHero Sep 5 at 21:08
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If you paint the inside surfaces flat black, or cover them with black felt, a "maze" will let air through but stop 99.9% of the light.
yes light can travel through a maze and of course the more intricate the maze the less light will escape.
As @S. McGrew mentionned, there are several techniques used to stop light, you can find these techs discussed on telecope forums. I'll add the the sand paper painted black.