A uniform plane wave traveling in air is incident normally on a half space occupied by a lossless dielectric medium of relative permittivity 4. Placing another dielectric slab between the air and the original medium as shown below can eliminate the reflections from this dielectric medium. 14 5 16 148=44 Air Find a relative dielectric constant and a thickness of the slab to accomplish this at the free space wavelength of 1.55 μm. Assume that the relative permeabilities of all the media are unity, i.e., they are all non-magnetic.

A uniform plane wave traveling in air is incident normally on a half space occupied by a lossless dielectric medium of relative permittivity 4. Placing another dielectric slab between the air and the original medium as shown below can eliminate the reflections from this dielectric medium. 14 5 16 148=44 Air Find a relative dielectric constant and a thickness of the slab to accomplish this at the free space wavelength of 1.55 μm. Assume that the relative permeabilities of all the media are unity, i.e., they are all non-magnetic.