refraction of light 2 - Physics 113 Lecture 16 Refraction...

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Physics 102: Lecture 17, Slide 1 Today’s Lecture will cover textbook sections 23.4-23.9 Physics 113: Lecture 16 Refraction of Light Physics 113 Dr. Renat Letfullin
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Physics 102: Lecture 17, Slide 2 Last Time: Snell’s Law Total Internal Reflection Fiber Optics Today: Brewster’s Angle Dispersion Lenses Physics 113 Dr. Renat Letfullin
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Physics 102: Lecture 17, Slide 3 n 1 n 2 Snell’s Law    n 1 sin θ 1 = n 2 sin θ 2 normal 2 θ θ 1 θ r Usually, there is both reflection and refraction ! Physics 113 Dr. Renat Letfullin
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Brewster’s angle …when angle between reflected beam and refracted beam is exactly 90 degrees, reflected beam is 100% horizontally polarized ! Reflected light is partially polarized (more horizontal than vertical). But…    tan θ B = n 2 n 1 n 1 sin θ B = n 2 sin (90- θ B ) n 1 sin θ B = n 2 cos ( θ B ) horiz. and vert. polarized θ B θ B 90º- θ B 90º horiz. polarized only! n 1 n 2
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Dispersion prism White light Blue light gets deflected more n blue > n red The index of refraction n depends on color! In glass: n blue = 1.53 n red = 1.52
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Skier sees blue coming up from the bottom (1) , and red coming down from the top (2) of the rainbow. Rainbow Wow look at the varia t ion in index o f refraction!
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