25A reflection n refraction

# 25A reflection n refraction - The Nature of Light Physics...

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1 Physics 1C Lecture 25A "Somehow light is particle and wave. The experimenter makes the choice. You get what you interrogate for. And you want to know if I'm a wave or a particle." --Tom Stoppard The Nature of Light The incident light ray will move in a straight line path as long as the medium does not change. But, when it encounters a boundary with a second medium, (at least) part of this incident ray is reflected back into the first medium. If the boundary is a smooth surface, the reflection is known as specular reflection . This means all the reflected rays will be parallel to one another. The Nature of Light Although diffuse reflection is more common, it is harder to mathematically model than specular reflection. If the boundary is a rough surface, the reflection is known as diffuse reflection . This means that the reflected rays will travel in a variety of directions. Diffuse reflection is how you can see most everyday objects. Law of Reflection The reflected angle, θ 1 , is the angle that the reflected ray makes with respect to the normal. We define a normal (perpendicular line to the surface) at the point where the incident ray hits strikes the surface. The incident angle, θ 1 , is the angle that the incident ray makes with respect to the normal. 1 1 The angle of incidence is equal to the angle of reflection. Refraction of Light The ray that enters the second medium is bent at the boundary. This bending of the ray is called refraction. The incident ray, the reflected ray, the refracted ray, and the normal all lie in the same plane. Also, when an incident ray of light in a medium

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## This note was uploaded on 02/11/2012 for the course PHYS 1C 1C taught by Professor Wethien during the Spring '11 term at UCSD.

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25A reflection n refraction - The Nature of Light Physics...

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