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a
Explanation: The Brewster angle is given by θb = tan-1(n2/n1), where n = √ε. Thus wecan 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.