# Refraction Of Light – Air Into Glass

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Purpose: When light travels through different mediums, it is being refracted. The purpose of this lab is to test Snell’s law of refraction. Hypothesis: The angles of refraction that I predicted from the angle of incidences by using Snell’s Law are below on the predicted angle Column. To obtain these values I used the index of refraction of crown glass because it is more likely close to the glass (plexiglass) that we are using. Angle of Incidence 0° 10° 20° 30° 40° 50° 60° Predicted angle of refraction 0 6.56° 13.0° 19.2° 25.02° 30.27° 34.74° Variables and Controls: Independent Variable: The angle of the light coming from the ray box or the angle of incidence Dependent Variable: The angle of refraction on the plexiglass. Controls: The mediums where light travels (air and plexiglass). Materials: - ray box - plexiglass - white paper, protractor and pencil Procedure: 1. I folded the blank paper into four equal parts. Then drew two intersecting lines perpendicular to each other. 2. Using the protractor I drew the angles of incidences or rays measuring 10°, 20°, 30°, 40°, 50° and 60°. 3. Then I drew a semi-circle on the top of the intersection representing the flexi glass and placed the flexi glass over the semi-circle. 4. Plugged in the ray box to a power source and using the single slit barrier, I placed the light ray along the normal to ensure that the light is not bent at this point. 5. I then placed the ray box allowing the light ray travels along the 10° then marked the refracted light on the glass. 6. And then repeated step 5 with 20°, 30°, 40°, 50° and 60°. 7. After that, I drew rays from the marks of the refracted light on the glass to the center. 8. Lastly measured and recorded the angles of refracted light