is
incident normally on a perfectly reflecting infinite wall at = a. Assuming
that the material of the wall is optically inactive, the reflected wave will be
given as
(a) 
(b)
(c)
(d) 
Answer:
(b) When a wave is
reflected from denser medium, the reflected wave is without change in type of
wave but with a change in phase by 180° or re radian. Therefore, for the
reflected wave we use 
and additional
phase of re in the incident wave. The incident em wave is
The reflected em wave is
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