x rays are left to visible light and radio waves are right.Both can penetrate but why visible rays cant.what property of waves effect the penetration power(is it like wave length frequency like that).answer me basically plzzz
Who told you light can't penetrate? Well I get quite a bit through my windows in the morning. Have you ever put a battery powered torch head in your mouth and seen your mouth glowing orange, if not try it on a small pen torch. Both these answers if you think carefully will help answer all your questions. Don't bother trying to fit a radio in your mouth it might be quite painful, and we know it's going to work.
Think power levels, sensitivity, frequency, Skin effect, penetration depth, photon energy levels, absorption. Light is not a special type of EM wave, it's just a band of waves we can see and at those frequencies materials tend to absorb or reflect most of the power. Take heat for instance which is basically lots of Infrared, can that pass through plastic? Yes it can.
But higher frequencies in the high 100sGhz don't pass through water very well. Even mobile phone reception is hampered buy heavy wooded areas due to the moisture in the trees and leaves. But visible light passes quite well through water.
If the power levels are high enough then any form of visible light could potentially pass through six inches of plastic. An example of a power level that could work is 8KW, but the distance would have to be quite close, this is the same as some X-ray machines. So you see it's not about dismissing something that does not seem to work when your in the middle of others around it that do. You have to consider why do the others work first. There will be limitations to the penetration through various materials of the whole of the EM spectrum, it just so happens that because we don't see light passing through an object we assume it's not.
Adam