You've asked a pretty complicated question because there are a lot of aspects you haven't nailed down. Photons of visible light do not go very far through matter, especially through metals like Osmium. On the other hand, you may be talking about long wave radio waves, or super-high energy gamma rays. These have different capabilities of going through matter.

Were you planning on setting up a house the 100 meter thick Osmium walls to try this out? Just joking... but seriously the answer is "it depends".

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