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User Name Thread Name Subject Posted
GUEST,Dave BS: GUEST: Dave (97* d) RE: BS: GUEST: Dave 28 Jan 16


"if you aim a torch at a brick wall, does it stop the light dead in it's tracks,"

Most photons will be absorbed by the atoms and molecules in the wall and converted to heat. Some will be reflected, allowing you to see the wall. None will continue through the wall unless its a glass wall.


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