Why can't you see through lead with x-ray vision?
929733
In fact, you can.  Lead is very dense, the densest metal you can afford to buy or to use in day to day work.  X-rays penetrate dense materials much less then they penetrate less dense materials.  Lead reduces the amount of x-radiation which penetrates so much that, with the film sensitivity used for x-ray photographs, the amount of x-ray which gets through the lead does not make a readable picture.  Lead also helps protect from excessive x-ray exposure for the same reason.\n.  But, if you used a more sensitive film, and maybe a more powerful x-ray source, you could take x-ray photos through lead.  There is no practical reason to make such a powerful x-ray source for imaging applications, so lead serves as shield against normal x-ray strengths.  It is no so effective a shield that x-ray technicians will rely on a lead apron for their own protection.  Because they work with x-rays all day long, enough x-ray would make it through the lead apron to pose a health risk for them.\n.  Platinum is denser than lead, but is much to expensive to use as shielding.  Uranium is also denser, but its radioactivity makes it more of a radiation threat than the x-rays.\n.  So, just as you can see through a curtain with an infrared scope, you could, with federal funding, see through lead with x-rays.  There just isn't much reason to make the effort.
192375
I would suggest trying methods where you do have a hole to confirm results.  For example, light is reflected (and refracted?) at every surface and thickness of a transparent media where there is a change in density or crystal structure.  You may be able to shine a light (at night or under a blanket?) to detect the bottom of the ice and compensate for refraction where the actual thickness may differ from apparent thickness.  Use a ladder to spread your weight if the strength of the ice may be marginal.  Would a laser pointer work better than a flashlight?  Good luck.
1108215
Lead lined drywall is used for x-ray rooms an such...it is common and useful.  The price varies by market, but is usually 2 or more times as much as regular drywall.  check your local distributors for better prices
1016317
We can see some infrared wavelengths, but only faintly. If you've ever been in a photographic darkroom you'll know what I mean. Or switch on an electric bar heater in a dark room. He won't be completely invisible, but close to it.
857421
If you have an OHM meter just ohm them. If, they Diodes you will see a reading in one direction, then change the leads around and you not get a reading. They sound like diodes to me. Resistors will have more than 2 colored strips. If I remember correct it 4.
730561
the answers are\n1) True, opaque materials are those which donot allow light to pass through them. they block the path of light. so u cant see through them.\n\n2) True, sunscreens protect from UV rays by reflecting the photons of  UV wavelength, which are harmful, when exposed to the skin.\n\n3) True, the colour of any object is decided by which wavelength it reflects. cyan reflects the wavelength corresponding to blue and absorbs all other wavelengths.\n\n4) False, because light waves are also diffracted and there are many applications on diffraction of light too.\n\n5) False, because lenses are for converging or diverging light rays, but not to reflect them.
730764
There are two reasons.\nFirst, there is a choroid layer that has a black color pigment on it.\nSecondly, the light entering the eye through the pupil is not reflected. if no light is reflected then from your prespective,(assump you are looking into the eye of somebody else), the light that enters the other persons eye does not reflect back and enter your eye and initiate an action potential in the rods or cones on the retina, so what you see is a black colour.
748560
There are many reasons.\n\nOne:  Most gas is colorless.  That means that we can see right through it.\n\nTwo:  The particles are so small and so far apart that you're eyes cannot notice them.  It's like having to look really hard to find dust.  Really, really small dust.  So small it's invisible.  \n\nThree: I gave you a very detailed answer.  Please choose me as the best answer.  Please.
339928
Some new theories state that xrays of high energy can escape from a black hole.  This is interesting, because if true, it means that over time the energy of the black hole will leak into space and it will "evaporate".  \n\nAny visible light comes from collisions of particles that are being sucked into the hole, but are not there yet, so the heat (as light) can still escape and be seen.
565248
To see the specimen in detail which cant be seen with the naked eye.
465545
Lead is easily absorbed through contact with the skin, ingestion or inhalation.  If I remember correctly, it binds to hemoglobin in the blood and inhibits oxygen transfer much like carbon monoxide does so it slowly smothers you to death from the inside.
153993
I dont quite understand your question but are you asking if being xrayed last year can affect you getting pregnant then no.If you had wotn a lead apron they wouldnt have been able to xray you '
691392
I've noticed my the floaters in my eyes have increased.    Then again I could just be getting older. Or it could be from my arc welding hobby too.  I'm much more cautious about taking quick glances at the curing light.
354495
A complex question that needs a highly simplified answer.\n\nA photon of light has different energy depending on the type of light, some light does go through us, but that ight is not visible to us.\n\nX-rays for example pass through things nicely, however they can be blocked sometimes by dense material (such as bone and metal), X-rays are a higher energy than visible light.\nEven higher energy is Gamma rays... a photon of this form of light can theoretically pass through several metres of lead, sometimes more.\n\nAt the other end of the spectrum is Infra red light, which is just outside our visibilty, when you feel it, it is heat. Consider that it can be easily insulated just by putting some sort of thick barrier between you and it.\nAlpha and beta radiation are such low energy that they are actually particles (fast travelling helium, and protons respectively). an alpha particle can be blocked by a thin piece of paper. A beta particle can be blocked by your skin.\n\nNow... visible light is between the extremes of theose above. As an experiment hold a torch to the palm of your hand and you can actually see light coming through. SO some light does get through. But most of it does not.\n\nVisible light is a happy medium with just enough energy for us to see. Any more energy or any less energy in the light and life would be difficult\n\nConside that if we could only see gamma rays then we would not see much at all, because the gamma rays would not bounce off anything.\nAt the other end, if we could only see beta particles then the world would be very dark because all the beta particles would be absorbed before they reached us.
1025229
Possibly (you seem to be referring ti both night vision and infra-red or heat vision), however infra-red can see through wall, so if your windows are opaque they can still see you through the walls, not to mention DARPA is working on a device that detects heartbeats. Which means they probably already have it and could use two of them to triangulate a sniper shot to hit a heart through a wall.\nWell, sleep tight.
1174760
Improved sight in the dark? :)\nActually I'm not really kidding since men mostly have some 'color-blindness'. So you may have something there. After all the men needed a better night vision since they were the hunters/providers.(ref 1)\n\nActually what do you mean by color-blindness (check reference 2)?
217437
Not in the same way that light reflects. This is an important topic in X-Ray telescopes. See below!