The region z0 is occupied by Teflon use 2 and the space z0 s
     The region z>0 is occupied by Teflon (use  =2) and the space z0 side of the boundary if the electric field intensity on the z 
  
  Solution
a. as field decreases for z>0, the density of field lines will be reduced by 2.
b. the new field intensity for z>0 will be E= 10/2 ay + 30/2 az= 5ay + 15 az
c. Each component will be reduced by 2

