refraction of light - Physics 113 Lecture 24 Refraction of...

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Physics 102: Lecture 17, Slide 1 Today’s Lecture will cover textbook sections 23.4-23.9 Physics 113: Lecture 24 Refraction of Light Physics 113 Dr. Renat Letfullin
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Physics 102: Lecture 17, Slide 2 Today: Refraction of light Snell’s Law Total Internal Reflection Fiber Optics Brewster’s Angle Experimental Activity: Snell’s Law Physics 113 Dr. Renat Letfullin
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Physics 102: Lecture 17, Slide 3 Refraction Reflection: Refraction: Absorption Flat Mirror: image equidistant behind Spherical Mirrors: Concave or Convex Flat Lens: Window Spherical Lenses: Concave or Convex Today Last Time Today θ i θ r θ 1 θ 2 n 2 n 1 θ i = θ r n 1 sin( θ 1 )= n 2 sin( θ 2 ) Physics 113 Dr. Renat Letfullin
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Physics 102: Lecture 17, Slide 4 Physics 113 Dr. Renat Letfullin    v = c n Speed of light in medium Index of refraction Speed of light in vacuum    n 1    v < c so Index of Refraction 186,000 miles/second: it’s not just a good idea, it’s the law! always!
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Physics 102: Lecture 17, Slide 5 Light Doesn’t Just Bounce It Also Refracts! Reflected: Bounces (Mirrors!) Refracted: Bends (Lenses!) f d d i 1 1 1 0 = + θ i θ r θ 1 θ 2 n 2 n 1 θ i = θ r n 1 sin( θ 1 )= n 2 sin( θ 2 ) Physics 113 Dr. Renat Letfullin
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Physics 102: Lecture 17, Slide 6 Snell’s Law n 1 n 2 When light travels from one medium to another the speed changes v=c/n, but the frequency is constant. So the
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