Question

Find the Brewster angle of a wave transmitted from a medium of permittivity 4 to a medium of permittivity 2.

(a) 35.26

(b) 53.62

(c) 26.35

(d) 62.53

I got this question by my college professor while I was bunking the class.

This key question is from Brewster Angle topic in chapter EM Wave Propagation of Electromagnetic Theory

Answer 1

Correct option is (a) 35.26

Best explanation: The Brewster angle is given by θb = tan^-1(n2/n1), where n = √ε. Thus we can express the formula in terms of permittivity as θb = tan^-1√ (ε 2/ε 1). Here ε1 = 4 and ε2 = 2. Thus we get θb = tan^-1√ (2/4) = tan^-1(0.707) = 35.26 degree.