Nokia Lumia phones do not support TV-out feature via cable but you can wirelessly show pictures and videos on your TV using the DLNA feature.
With the free Play To application for Nokia Lumia phones you can connect to other DLNA capable devices (TV’s, BlueRay players, Win 7 Mediaplayers etc.) via WLAN network.
You can download the Play To application from the Store or Marketplace.
More detailed information about DLNA can be found from website http://www.dlna.org.