# What do you see when you are inside a transparent conducting material?

Lets say that there exists a transparent conducting material. Lets carve a cavity in the meat of the conductor big enough for a person to stay in.

There exists an external electric field. But, We know that electric field in the cavity is zero.

So does this mean that the person inside can see nothing of the outside world??

Ofcourse, light is not just an electric field. But can it be treated like one in this case?

• There is no electrostatic field. Light would propagate just fine, as it does through, say, your touchscreen on your phone... – Jon Custer Jul 10 at 1:42

Now let's dial back the "perfect conductor" condition a little bit. For a material with a finite conductivity electromagnetic radiation can penetrate into the material just a little bit (as the electrons can't adjust perfectly to compensate) and is exponentially attenuated the farther it goes into the material. The distance that it takes for the EM wave to be attenuated by a factor of $$1/e \approx 0.36$$ is called the skin depth of the material and is inversely related to the square root of the conductivity -- the less conductive the material the farther EM waves can propagate through it.