GATE EC 1987 Electromagnetics Solution Q 2

GATE EC 1987 Electromagnetics Solution Q 2

For an electromagnetic wave incident from one medium to a second medium, total reflection takes place when

(a) The angle of incidence is equal to the Brewster angle with E field perpendicular to the plane of incidence

(b) The angle of incidence is equal to the Brewster angle with E field parallel to the plane of incidence

(c) The angle of incidence is equal to the critical angle with the wave moving from the denser medium to a rarer medium

(d) The angle of incidence is equal to the critical angle with the wave moving from a rarer medium to a denser medium

Ans : c)

Explanation

Total internal reflection is the special kind of refraction of the wave in which the refracted ray come back to the incident medium.

The conditions for the TIR are as

1.The wave must be moving from denser to rare medium
2.The angle of incidence must be greater than certain minimum angle called as critical angle.

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