102 lect16_handout

102 lect16_handout - Physics 102: Lecture 16 Introduction...

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Physics 102: Lecture 16, Slide 1 Physics 102: Lecture 16 Introduction to Mirrors
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Physics 102: Lecture 16, Slide 2 Phys 102 recent lectures Lecture 14 – EM waves Lecture 15 – Polarization Lecture 16 – Reflection Light as a wave Light as a ray
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Physics 102: Lecture 16, Slide 3 Light incident on an object • Absorption Everything true for wavelengths << object size • Reflection (bounces) – See it – Mirrors • Refraction (bends) – Lenses Often some of each
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Physics 102: Lecture 16, Slide 4 x z y Recall: wavefronts y z y z λ Wavefronts represent “crests” of EM wave x z Top view: Direction of propagation λ
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Physics 102: Lecture 16, Slide 5 Huygens’ principle Every point on a wavefront acts as a source of tiny “wavelets” that move forward. “wavelet” wavefront Direction of propagation
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Physics 102: Lecture 16, Slide 6 Law of Reflection θ i θ r Incident wave Reflected wave θ i = θ r Angle of incidence = Angle of reflection Describe light as “rays” along direction of propagation of EM wave
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Physics 102: Lecture 16, Slide 7 Object Location • Light rays from sun bounce off object and go in
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102 lect16_handout - Physics 102: Lecture 16 Introduction...

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