Charlotte's+Page

=Signals.=

Radiation for long-distance communication can be affected by **__Refraction__** and **__Diffraction__**. Refraction of waves can only occur at a boundary (e.g. Glass). > >
 * This can lead to loss of signal at the reciever.
 * Microwaves arent affected by refraction.

=Refraction and Diffraction.=

Refraction: The change of direction of a wave as it passes from one material to another.
 * __Diffraction:__** The spreading out of waves as they pass through a gap.
 * __DONT CONFUSE DIFFRACTION WITH REFRACTION!__**