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It also depends what you refer to as 'light'. Electro magnetic radiation in general does pass through matter to a greater or lesser extent. X-Rays wouldn't work otherwise. The smaller the wavelength, the more likely it is to pass between the atoms in the material without hitting them and being absorbed or bounced back.
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Are you sure that's how it works, by that logic wouldn't that mean any material that isn't soundproof is somewhat translucent? That would also mean that radio waves (that can be metres long)can't travel through, well anything.
Of course I'm probably just saying something stupid.