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Lecture 14 - Refraction (Ch. 25.5-25.8)

Lecture 14 - Refraction (Ch. 25.5-25.8) - Lecture 15 Ch 25...

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Lecture 15 Ch 25 Reflection and Refraction of Light

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Midterm
The Ray Model of light o The ray model is a useful simplification for describing how light waves travel o A “ray” is a line perpendicular to the wavefronts (crests) of the wave The diagram shows a traveling plane wave and the corresponding rays

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Law of Reflection Angle of Reflection Equals the Angle of Incidence
Law of Reflection Example Problem: What is theta?

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Law of Reflection Example Problem: What is theta? 90 - 35 = 55 65 25 35 90 - 65 = 25 180 - 120 - 25 = 35 55
Light at a Boundary o At a boundary between two different media, light can be both reflected and transmitted o The proportion of light reflected vs. transmitted depends on the angle and the optical properties of the media

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Index of Refraction: o Another way to write Snell’s law:
Index of Refraction: Note: Light will always travel from point a to point b in the shortest time! Into slower medium : bent towards normal ( θ 2 < θ 1 ) Into faster medium: bent away from normal ( θ 2 > θ 1 )

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Example Problem Light travels from air into an optical fiber with an index of refraction of 1.44. 1) In which direction does the light bend? 2) If the angle of incidence on the end of the fiber is 22 o , what is the angle of refraction inside the fiber?
Example Problem Light travels from air into an optical fiber with an index of refraction of 1.44. 1) In which direction does the light bend? 2) If the angle of incidence on the end of the fiber is 22 o , what is the angle of refraction inside the fiber?

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