Morissette,Jessie,436784,PHYS1007E-Lab3

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Apr 3, 2024

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Experimentation of Snell’s law of refraction Jessie Morissette Morissette, Jessie, 0436784, PHYS 1007E-Lab 3 Page 1 of 7
Introduction Question 1 a) A light ray traveling in water is incident upon a transparent material. The angle of incidence is 52.0°, and the transmitted ray is refracted at an angle of 19.0°. What is the speed of light in the transparent material (in m/s)? b) What If? Suppose the speed of light in another transparent material is exactly half that in vacuum. If light enters this substance from water, what angle of incidence for the light ray in the water would give the same 19.0° angle of refraction in the material (in degrees)? Morissette, Jessie, 0436784, PHYS 1007E-Lab 3 Page 2 of 7
Materials Cardboard, paper, 4 pins, ruler ( ± 0.5 mm), protractor ( ± 0.5 ° ), transparent container filled with water. Figure 1 Schematic diagram of experimental set-up (top view) Figure 2 photograph of experimental set-up (top view) Morissette, Jessie, 0436784, PHYS 1007E-Lab 3 Page 3 of 7
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Results Figure 3 Schematic diagram with incident angle of 20 ° Figure 4 Schematic diagram with incident angle of 30 ° Morissette, Jessie, 0436784, PHYS 1007E-Lab 3 Page 4 of 7
Figure 5 Schematic diagram with incident angle of 45 ° Figure 6 Schematic diagram with incident angle of 60 ° Morissette, Jessie, 0436784, PHYS 1007E-Lab 3 Page 5 of 7
Calculations Table 1 : Incident angle, refracted angle and index of refraction of water taken from measurements 1 to 4. Measurement # 1 (degrees) (incident angle) 2 (degrees) (refraction angle) n water 1 20 21 0.954 2 30 23 1.28 3 45 22 1.89 4 60 26 1.98 Morissette, Jessie, 0436784, PHYS 1007E-Lab 3 Page 6 of 7
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Discussions My results showed that my index of refraction with associated uncertainty was 1.53 ± 0.5 which is within 1.333, the index of refraction of water. This was probably due to the fact that I used a protractor, which has a very small increment of uncertainty compared to written calculations. A possible source of error could definitely be the way we view how to do this experiment and potentially place the pins the wrong way. There were also the corners of my plastic containers that would seem to create a blind spot, and I couldn’t see the pins during that time. Perhaps if we would use a round plastic container it would resolve the problem. Overall, this experiment was a very fun way a viewing Snell’s law of refraction. Morissette, Jessie, 0436784, PHYS 1007E-Lab 3 Page 7 of 7

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