# ETSU PHYS 2020 - Lecture Notes (16 pages)

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## Lecture Notes

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## Lecture Notes

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Lecture Notes

Pages:
16
School:
East Tennessee State University
Course:
Phys 2020 - Gen Physics II Noncalc
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PHYS 2020 General Physics II Course Lecture Notes Section XI Dr Donald G Luttermoser East Tennessee State University Edition 3 3 Abstract These class notes are designed for use of the instructor and students of the course PHYS 2020 General Physics II taught by Dr Donald Luttermoser at East Tennessee State University These notes make reference to the College Physics 9th Edition 2012 textbook by Serway and Vuille XI Reflection and Refraction of Light A Huygens Principle 1 In 1678 Huygens proposed the wave theory of light a At that same time Newton maintained that light acted like a particle b As we saw in the last section Planck derived in 1900 that light has the characterists of both a wave and a particle a wavicle which he called a photon c In the last sections of the notes we discussed the particle characteristics of a photon In this section we will concentrate on the wave like characteristics 2 All points on a wavefront can be considered point sources for the production of spherical secondary wavelets After time t the new position of the wavefront will be the surface of tangency to these secondary wavelets This geometrical argument is called Huygens Principle r ct old wavefront t 0 new wavefront XI 1 XI 2 PHYS 2020 General Physics II B Reflection of Light 1 When light travels from one medium to another part of the light can be reflected at the media interface a Reflection off of a smooth surface is called specular reflection which we will assume from this point forward b Reflection off of a rough surface is called diffuse reflection 2 Law of Reflection The angle of incidence with respect to the normal of the reflecting surface i equals the angle of reflection r i r XI 1 normal line incident ray reflected ray i r Reflecting Surface 3 The amount of energy that is reflected compared to the amount incident is called the reflectivity of the surface a This also is called albedo b The reflectivity of a mirror is about 96 albedo 0 96 XI 3 Donald G Luttermoser ETSU C

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