Physics 100- in class notes.docx

# Physics 100- in class notes.docx - Section 1.1 Observation...

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Section 1.1 Observation 1 Light travels through a uniform medium (including empty space) in a straight line from a source. Idealize: think of a narrow beam of light as a “ray” ie. arbitrarily thin line segment in a certain certain direction “Ray diagrams”- show how a light ray travels- path followed. If the medium is not uniform (stuff in the way) what can happen? A few basic things 1. Scattering from small particles 2. Absorption 3. Reflection- from surfaces 4. Refraction (transmission) of light from one medium to another a. Transparent media Reflection: Two main extreme types of reflection 1. Diffuse reflection a. Light goes in all directions away from the reflecting surface ______>_____>_______ ←{ object } (light ray) Diffuse reflection (How we usually see our surroundings!) 2. “Specular or “mirror-like” reflection Light ray travels in specific direction after reflection Terminology & Definitions- “Reflection” will mean mirror-like reflection Ray diagram for reflection-

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(normal means perpendicular) Angles are referred to the normal line Label angles using greek lowercase “theta” θ “Law of [ spectral ] Reflection” a. Θref = θi b. Reflected Ray lies in the plane determined by the incident ray and normal line (all 3 are in the same plane; that plane is perpendicular to the mirror) Example
• Fall '15
• Angle of Incidence, Total internal reflection, Geometrical optics

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