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
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
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
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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