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Lecture%2034%202220%20Spring%202009 - Fizeaus Method d is...

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1 Fizeau’s Method d is the distance between the wheel and the mirror t is the time for one round trip • Then c = 2 d / t Fizeau found a value of c = 3.1 x 10 8 m/s The Ray Approximation in Geometric Optics Geometric optics involves the study of the propagation of light It uses the assumption that light travels in a straight-line path in a uniform medium and changes its direction when it meets the surface of a different medium or if the optical properties of the medium are nonuniform • The ray approximation is used to represent beams of light Ray Approximation The rays are straight lines perpendicular to the wave fronts With the ray approximation, we assume that a wave moving through a medium travels in a straight line in the direction of its rays Ray Approximation, cont. If a wave meets a barrier, we will assume that λ << d d is the diameter of the opening This approximation is good for the study of mirrors, lenses, prisms, etc. Reflection of Light A ray of light, the incident ray , travels in a medium • When it encounters a boundary with a When it encounters a boundary with a second medium, part of the incident ray is reflected back into the first medium
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