4.6
4.1
(a)
(b)
4.2
4.3
Exercises
Solar light is coming from air (n 1 = 1) to the upper glass layer of a solar cell (n 2 = 1.5).
The light has an angle of incidence of θ i = 0 ° . What is the reflectivity at the air–glass interface? Assume
that the solar light is randomly polarized.
Imagine now an angle of incidence change of θ i = 30 ° . Calculate the reflection in this case. Assume
again that the solar light is randomly polarized.
Assume a light beam propagating from a medium with refractive index n 1 = 1.5 to a medium with refractive
index n 2 = 1. Determine the critical angle.
Let us assume that solar light reaches a silicon solar cell at an angle of incidence of θ i = 0 ° . The refractive index
of silicon is assumed to be n Si = 3.5. The refractive index of air is n air = 1. What percentage of light would be
lost due to reflection at the air–silicon interface? Assume that the solar light is randomly polarized.