for what angle of incidence the lateral shift produced by parallel sided glass plate is (i) zero (ii) maximum

Answer 1

(i) There is no lateral shift for zero degree incidence

(ii) The lateral shift approaches the plate thickness t for angle of incidence of 90 degrees.

For details about case ii, see
http://catarina.udlap.mx/u_dl_a/tales/documentos/lfa/dominguez_r_mz/capitulo3.pdf

Answer 2

90

Answer 3

When the lateral shift is minimum and maximum