A LED is connected to a fiber which has attenuation coefficient a B = 3dB/km and is 0.4km long. LED Light is launched from air into one end of the fiber and exits at the other end. The objective of this problem is to find the fraction of power reaching the other end in air. Find (a) the R and T for air to fiber interface, (b) the R and T for fiber to air inter- face and (c) fraction of power transmitted with the attenuation and reflections in (a) and (b) accounted for. Assume =2.25, and = , for the fiber. (Note: You need a which determined transmitted electric field. Notice the relation between a and adB)