# Dimensions of obstacle needed to block light?

How many dimensions are required minimum for an object to block light?

in 1d I doubt it's possible.

in 2d I think it could do it if only the light was limited to a dimension perpendicular to the 'thickness' dimension

in 3d I think it could do it no matter what dimension the object was looked at in.

Clarification: 3d -> A block of wood can "block light" (make a shadow) no matter how you shine light at it.

Edit: What about what are the minimum dimensions needed to block light assuming you are dealing with an $n$ dimensional space?

• As Jim said in his answer, I don't think it's clear what you're asking. Could you clarify? Aug 18, 2012 at 2:53
• Also depends on how many dimensions you're considering in the first place. In 1D, a 1D object would successfully "block" light, same goes for a 2D/3D object in their respective number of dimensions. Nov 25, 2012 at 18:38
• Ohhhh haha interesting :). So how about the minimum number of dimensions needed to block light from $n$ dimensions? Nov 26, 2012 at 3:46