Lab 5

# Lab 5 - Lab 5 Geometric Optics Brian Harmer 903366445 March...

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Lab 5: Geometric Optics Brian Harmer 903366445 March 4, 2009 Introduction:

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In this lab we observed properties of light rays, both physical and geometric. Our goal was to verify Snell’s law of refraction using both redirect and focus light rays. We used a ray box that produces parallel rays of white light which was essential to our experiment and overall goal. We will be using both think and thick lenses to observe how the paths of the light rays differ. Procedure: In the first section we investigated Snell’s Law and total internal reflection. We predicted the angle at which the rays exit the second interface for the light ray passing through the trapezoid. This was done using Snell’s Law which is given bellow: n 1 sin a i = n 2 sin t (1) Next we rotated the trapezoid to create total internal reflection. This is where light rays enter the prism and reflects off of and transmits through the back surface. We again will use the data to confirm Snell’s Law. Figure 1: light ray entering trapezoidal prism The second part consisted of beaming light through thick lenses to observe different properties. First we looked at the focal length for a bi-convex lens and how it varied as it moved
closer and farther. We say that the focal length stayed constant for this case. Next we investigated spherical aberration which is present when two focal points exist. Spherical aberration is caused when there is an increase in refraction of the light rays due to the ray striking the lens near the edge. For the last section of part two we took a look at one dimensional magnification. We found the magnifications for both the reducing and enlarging lens

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Lab 5 - Lab 5 Geometric Optics Brian Harmer 903366445 March...

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