# 452b - —.¢.— The answer is(5 Light reﬂected at an...

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Unformatted text preview: —.¢.— The answer is (5:) Light reﬂected at an angle between ii” and 9d” will at least be partially polarized because the electric ﬁeld vibrations parallel to the surface are more strongly reflected. Brewster’s ongle, BE, corresponds to the angle between the reflected and refracted beams at which all the reflected light is polarized. In our benchtop refractometer, the horizontally polarized light reflecting from the sample must pass through a polarizing ﬁlm. With the transmission axis oriented vertically, the ﬁlm will act to ﬁlter all but the vertical components of the electric ﬁeld vibrations of the radiation incident upon it. In other words, the polarizer will act to ﬁlter out horizontally polarized light. Therefore, transmitted light will be minimal when the laser is incident on the sample at Brewster’s angle. 1|lll'hen the initial medium is empty space or the air, which has an i ndeit of refraction very nearly 1, the tangent of Brewster's angle is simply the indent of refraction of the reﬂecting medium. tan 6B: :1 The tangent of so” is eas to recall if you remember the ratio of sides of the so-ao- 90 right triangle: 1, d3, 2 [4'3— - LT} {tangent = opposite over adjacent} REMEMBER THE RATIO OF SIDES OF THE RIGHT TRIANGLES, ID-IEI-D-‘S‘D i1,-.I'r3_, 1} AND 45415-9D :1, © 1. m. WHICH ARE UFTEH I'IIE'I!r 1II'ALUEE'r IF ‘I'ﬂLI HA'II'E TIE} PULLTRIGﬂNﬂMETE'i" ﬂUT OF THE BLUE on a coMPaEHEHSIvE Exam. c zoos .J Ins-HEEL ...
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