983_Physics ProblemsTechnical Physics

983_Physics ProblemsTechnical Physics - 324 P35.19 The...

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324 The Nature of Light and the Laws of Geometric Optics P35.19 nn 11 22 sin sin θθ = : θ 2 1 2 = F H G I K J sin sin n n 2 1 100 30 150 19 5 = ° R S T U V W sin .s i n . . 2 and 3 are alternate interior angles formed by the ray cutting parallel normals. So, 32 19 5 == ° . 30 0 34 4 i n i n . = FIG. P35.19 *P35.20 For αβ += ° 90 with +++ = ° θαβθ 12 180 we have +=° 90 . Also, ′ = and 1 sin sin = n . Then, sin sin cos 1 90 =− = bg FIG. P35.20 sin cos tan 1 1 1 n 1 1 = tan n . P35.21 At entry, sin sin = or 1 00 30 0 1 50 2 i n. i n °= 2 19 5 .. The distance h the light travels in the medium is given by cos . 2 200 = cm h or h = ° = 212 . . cm cos19.5 cm . FIG. P35.21 The angle of deviation upon entry is αθ θ =−= ° − ° = ° 30 0 19 5 10 5 . . The offset distance comes from
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