Physics4BL 5 - B r ian Sek May 28, 2009 Physics 4BL, Lab 7...

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Brian Sek May 28, 2009 Physics 4BL, Lab 7 Lab Partner: Morgan Fryar Geometric Optics Introduction The goal of this lab is to observe the behavior of light when it passes through lenses. First, Snell’s Law will be examined, and then total internal reflection will be observed. The next part deals with thick lenses, their focal points, and their magnification. After that, the properties of thin lenses will be observed, followed by image formation and its magnification. The lens potions of the experiments use three lenses; a biconvex lens, a biconcave lens, and a plano-convex lens. Experimental Results Part 1: Snell’s Law and Total Internal Reflection For the first part of the lab, a trapezoidal prism is used, as well as a ray box. The slits on the ray box are arranged so that only one beam of light appears; this beam is shot through the prism which is positioned so that the trajectory of the light does not change. The prism is then moved 45 degrees. The trapezoid and the rays are traced. A protractor is then used to measure the angles of the rays. After measuring the rays, the index of refraction for the prism could be calculated. After this, the prism is moved so that the ray of light does not escape the prism, but totally internally reflects instead. The rays are traced again. Snell’s Law TIR Incident 46° 33° Reflected 46° 0 refracted 43° 90°
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Table 1: As predicted, the incident light ray has the same angle as the reflected light ray. Part 2: Thick Lenses The first step of this part is to measure the focal lengths; this can be done by adjusting the ray box so that three rays are emitted. Place the biconvex lens in front of the rays, then move it horizontally and observe the light behavior. Trance the lens and measure the focal points. biconvex
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Physics4BL 5 - B r ian Sek May 28, 2009 Physics 4BL, Lab 7...

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