申論題

6. (20%) Consider a structure with three regions, region 1, 2, and 3. Region 1, x>d, is free space. Region 2, O＜x＜d ,is a perfect dielectric of ε=4ε₀, and μ= μ₀. Region 3, x

(b) Find, that is, immediately adjacent to the x=d plane and on the free-space side, at that instant of time.