Lecture 33 - Reflection and refraction [Compatibility Mode]

Lecture 33 - Reflection and refraction [Compatibility Mode]...

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1 Lecture 33 Reflection and refraction Reflection and refraction. Introduction to geometric optics Select an object of your choice (table, book, coin, neighbor’s head). Think about: • what it means to “see it” EM waves (light) from lamps hit surface and are reflected. • how you perceive the position of that object Waves propagate spherically in all directions from object. Your eye is sensitive to light brain “traces back” to where the light comes from. 3D perception comes from brain comparing images from each eye. Light rays = Geometrical abstraction that allows us to work with the direction that an E/B wave travels Instead of drawing fields, we draw a “ray” Ray : a line in the direction along which light energy is traveling Ray Model of Light Light travels through a transparent medium in straight lines at a speed v = c / n ( = index of refraction) •L i g h t r a y s do not interact with each other A light ray continues forever unless it interacts with matter Interactions light/matter: medium 1 medium 2 reflection refraction scattering absorption at an interface between two media reflected and refracted within a medium, light can be scattered or absorbed
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Lecture 33 - Reflection and refraction [Compatibility Mode]...

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