Part I: Reflection In part I we will explore the relationship between the angle of incidence (the angle between the incident ray and the normal) and the angle of reflection (the angle between the reflected ray and the normal). The experiment is performed in the link below: https://www.youtube.com/watch?v=8VZHym6HqVU A laser ray is pointed at a semi-circular glass from left side. A protractor underneath the glass will allow us to measure angles. Let's examine what happens to the ray as it reaches the diagonal side of the glass. That side is the glass-air boundary. As you can see the ray splits into reflected and refracted rays. At small angles of incidence, most of the incidence ray's energy goes to the refracted ray. That's why the reflected ray is barely visible in the first 50 seconds of the video. As the angle of incidence increases, the proportion of the energy that goes to the reflected ray increases as well. Starting at a certain angle (called angle of total reflection), all of the incidentray's energy goes to the incident ray and the refracted ray disappears. You can see that happening few second after the first minute of the video. In order to explore the relationship between the angles of incidence and reflection, measure both angles at 5 different times between 0:55 - 1:22 time interval of the video. Data: Trial Incident angle Reflected angle 1 2 4 5 Your conclusion

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