Transmission Media -Cont

o    We  have  a  beam  of  light  moving  from  a  more  dense  to  a  less  dense medium o    We gradually increase the angle of incidence measured from vertical axis o    As angle of incidence increases, so does the angle of refraction o    The angle at which refracted line lies on the horizontal axis is called o    Critical Angle •     Reflection o    When angle of incidence becomes greater than critical angle, reflection occurs o    Light no longer passes into the less denser medium but is reflected back into the same medium o    The Angle of Incidence (I) = Angle of Reflection (R) •     Optical Fibers & Reflection o    Optical fibers use Reflection to guide light through a channel o    A glass or plastic CORE is surrounded by a CLADDING of less dense glass or plastic o    The difference in the density of CORE and CLADDING is such that the beam of light moving through the core is reflected off the cladding o    Information is encoded onto a beam of light as a series of ON-OFF flashes that represent 1 and 0 bits