LAb Bending Light Phet Investigation 20-21 PDF

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CP Physics - Bending Light Qualitative Investigation Go to phet.colorado.edu and locate the “Bending Light” Simulation. Please answer all questions in complete sentences. Click on the “INTRO” option 1) Play with the simulation. Adjust the index of refraction of both media. 2) Set the top material to air, and the bottom material to water. Draw a sketch of the beam and boundary. Include labels for the incident ray, the reflected ray, and the refracted ray.

3) In the bottom left of the simulation, there is an intensity sensor. How does the intensity of the refracted ray change as you increase the angle of incidence? How does the intensity of the reflected ray change as you increase the angle of incidence?

4) Set-up the top material to be air and the bottom material to be glass. Center the protractor on the interface where the light hits the glass. Set the angle in the air to be 45o. Read the angle of refraction in the glass from the protractor. If your answer is not about 27o then your protractor is probably not correctly placed. A) Set the top material to air, and the bottom material to Mystery A. What were your angles of incidence and refraction? Angle of incidence_____o Angle of refraction____o B) What is the index for Mystery A?

C) What is the speed of light when travel through Mystery material A?

5) ) Set-up the top material to be air and the bottom material to be glass. Center the protractor on the interface where the light hits the glass. Set the angle in the air to be 60o. Read the angle of refraction in the glass from the protractor. If your answer is not about 35o then your protractor is probably not correctly placed. A) Measure the angle of reflection Angle of incidence=60o angle of reflection____o B) Adjust the angle of incidence to many different angles. In all of these situations, how does the angle of incidence compare to the angle of reflection?

6) When the beam is going from water to air, describe what happens when you increase the angle of incidence past 50 degrees? Measure and record the intensity of the reflected ray when this is happening.

Reload the simulation, but this time click on the “PRISMS” option. 6) Play with the simulation. Use different shaped prisms, try using multiple prisms, adjust wavelength, and switch between 1 beam, 5 beams, and white light. 7) Have a single red beam refract through a prism of your choice. Slowly adjust the wavelength (color) of the beam while keeping everything else constant. Describe what happens to the refracted ray.

8) Based off of what you described in #7, what relationship is there between index of refraction and the wavelength of light?

9) Because different wavelengths (colors) refract at different angles in the same medium, it is possible to use a prism to “separate” the colors from white light. Switch your source to white light, and try to find a way to use a prism to “separate” the colors. Describe what you needed to do to in order to disperse the color. What prism worked best for you in this process?...