In the X-Men: First Class movie, Sebastian Shaw holes himself up within the reactor chamber of his submarine. While in this room, Charles Xavier cannot sense or find him using his telepathy. He describes a "void" in the middle of the ship.
The walls of this room appear to be covered in mirrors. Once Erik begins smashing these mirrors (or more correctly, Shaw begins smashing them using Erik), Xavier can start seeing inside the room.
What is it about these "mirrors" that shut Xavier out? I am not aware of any instance in the comics where Xavier's telepathy was thwarted by standard mirrors.
Answer
The substance used to shield that room, making it proof against radiation is called Radiation Shielded Glass. This implies that Xavier's telepathic powers are, in theory, a form of electromagnetic radiation, capable of being shielded against using this material.
This glass is a composite material using lead oxide and barium making the glass able to block radiation. It is not tempered so it breaks relatively easily.
While it may resemble ordinary mirrors, it is most assuredly not. The material sells for $450 to $900 a square meter.
This would also correspond with why Magneto has some level of natural immunity to Xavier's telepathic powers.
Radiation Shielding Glass is a high quality optical grade lead barium glass with more than 60% heavy metal oxide including at least 55% lead oxide with sizes up to 96”x48”. The glass offers visual clarity and high light transmittance, but does not discolor due to radiation. Both glass surfaces are mirror polished.
Our standard 7mm thick lead glass shields up to 1/16” (1.6mm) @ 150Kv X-Ray Peak voltage but we can achieve higher lead equivalency by laminating multiple layers of glass together.
This glass is used to shield a variety of x-rays in medical and industrial facilities. REF: A&L Shielding ->Radiation Shielded Glass
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