Reflection and Refraction

# Reflection and Refraction - Reflection and Refraction Class...

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Reflection and Refraction Class: Physics 182 Lab Summer II TA: Joy Ding Date of Experiment: 7/27/10 Due Date: 7/30/10 Itzel Rodriguez

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Goal of Experiment: The purpose of this lab is to derive the Law of Reflection as well as figuring out the size of a mirror in order to see oneself. Also, it is to find the distance of the image from the mirror as well as working with Snell’s Law. Introduction: Light rays begin at a certain point and then expand in every direction. When the light enters a medium part of the ray will refract and the other part will reflect. A reflected ray θi hits a point on the edge of mediums at an incident angle. On a mirror that is flat the ray is reflected at a certain angle better known as θ r and this ray is equal to the incident angle; therefore = θi θ r . Another important thing to know is what the normal is. The normal is line perpendicular to the plane of the reflection and θ is the angle formed from the normal. In order to find the position of the image, parallax is needed. Parallax is when an object that is closer moves relatively to a background that is stationary. When a certain image and some other object representing the initial image, as the point of where the viewing is taking place changes the image is still found. When refraction occurs a ray enters a different medium making it change the angle . θt According to Snell’s law, θt is predictable because of the equation = nisinθi ntsinθt - θt and θi are the transmission and incident angles, ni and nt are the speed of light divided by the corresponding materials speed of light. Procedure: Plane Mirrors- Using a single wave setting, plug in the light source. Then put a plane mirror on a protractor as seen in figure 2. Then change the incident angle ten different times. For each different incident angle measure the reflective angle and record. The next part is dealing with larger mirrors. For
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Reflection and Refraction - Reflection and Refraction Class...

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