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Quiz 2 solution

# Quiz 2 solution - ELEC308(Spring 2008 Quiz 2 TA solution...

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(a). Brewster’s angle is a particular angle of incidence at which the incoming unpolarized wave made up of two incoherent orthogonal states, only the component polarized normal to the incident plane and therefore parallel to the surface will be reflected. 3 points (b). under Brewster’s angle, using the given Fresnel equation and Snell’s law, n n n n n n n n n r p p p p p p p p p p p p p p p 1 2 2 2 2 2 2 2 2 2 2 2 2 4 2 2 2 2 2 2 tan cos sin cos 2 ) sin 2 1 ( 1 cos 2 sin 4 cos 4 1 1 sin cos sin cos sin cos 0 ) ( - = = - ± = + - ± = - = - + - - = = θ In this problem o 7 . 56 , 52 . 1 n . 7 points Problem 2 (a). since the electric and magnetic fields cannot be discontinuous at a boundary, in total internal reflection, there is a wave whose amplitude drops off exponentially as it penetrates the less dense medium. The disturbance advances in the x-direction as a surface. This wave is evanescent wave. 3 points (b). 7 points ELEC308 (Spring 2008) Quiz 2 TA solution

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Quiz 2 solution - ELEC308(Spring 2008 Quiz 2 TA solution...

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