Lecture 5 SSI 10 Pre Lecture

Lecture 5 SSI 10 Pre Lecture - Physics7CSSI2010...

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Physics 7C SSI 2010 Lecture 5: Lenses and Optics
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Agenda Refraction Review Total Internal Reflection Lenses and Optics Ray Tracing Thin Lens Equation Multiple Lenses
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Reflected Ray: The law of reflection Normal Line Angle of Incidence Angle of Reflection Law of Reflection: θ i = θ r
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Refracted Ray: The law of refraction Normal Line Angle of Incidence Angle of Refraction Law of Refraction or “Snell’s Law:” n 1 sin θ 1 =n 2 sin θ 2 n : “index or refraction” = speed of light in vacuum speed of light in material
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Observe the Water Prism What happens if the angle in the water gets increasingly large? Light travels faster in air (medium 2) than it does in water (medium 1).
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Total Internal Reflection Incident Reflected Transmitted θ i θ r θ i θ r There is no solution of Snell’s Law for this incident angle, so there is no refracted ray, only a reflected ray. → Total Internal Reflection
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Total Internal Reflection θ i θ r θ c θ r The critical angle, θ c , is the greatest incident angle for which there is refraction.
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Lecture 5 SSI 10 Pre Lecture - Physics7CSSI2010...

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