Name Date Pd Wave Model of Light - Worksheet 2 Reflection and Refraction with Wavefront Diagrams Part A: Reflection 1. The incident ray is shown. Showing reflection, supply the normal, the missing wavefront(s) and ray(s). 2. The reflected wave fronts are shown. Showing reflection, supply the normal, the missing wavefront(s) and ray(s). Part B: Refraction 3. 1. Below are monochromatic light rays traveling through three substances A, B, and C. A A B B C C a. Rank the speed of light in each of the materials from fastest to slowest. 1st 2nd 3rd 1st 2nd 3rd ` b. Rank the index of refraction of each of the materials from highest to lowest. 1st 2nd 3rd 1st 2nd 3rd ` c. Rank the wavelength of the light in each of the materials from longest to shortest. 1st 2nd 3rd 1st 2nd 3rd ` d. Rank the frequency of the light in each of the materials from highest to lowest. 1st 2nd 3rd ©Modeling Instruction Program 2008 1st 1 2nd 3rd ` L2-Wave Model ws 2 v4.0 4. The incident wave fronts are shown. Showing refraction, supply the normal, the missing wavefront(s) and ray(s). 5. The refracted ray is shown. Showing refraction, supply the normal, the missing wavefront(s) and ray(s). Air: 1.00 Water 1.33 Alcohol 1.36 Crown glass Flint glass Diamond 1.52 1.61 2.42 speed of light in a vacuum: 3.0x108m/s 6. What is the speed of light in diamond? 7. Dinah Might wants to hide a piece of crown glass, and finds a chemical in which the speed of light is 1.97x108 m/s. Will this chemical work? ©Modeling Instruction Program 2008 2 L2-Wave Model ws 2 v4.0 8. The wavelength of red light in air is 6.0x10-7m and in an unknown chemical it is 3.76x10-7m. a. What is the index of refraction of the chemical? b. What is the frequency of the light in the air and in the chemical? Part C: Reflection and Refraction 9. The incident ray is shown. Showing reflection and refraction, supply the normal, the missing wavefront(s) and rays. slow ©Modeling Instruction Program 2008 fast 3 L2-Wave Model ws 2 v4.0 10. The reflected ray is shown. Showing reflection and refraction, supply the normal, the missing wavefront(s) and rays. fast slow 11. Certain relationships should clearly show in all of your wavefront diagrams. a. How does the incident frequency compare to the reflected frequency? How do you know? b. How does the incident wavelength compare to the reflected wavelength? How do you know? c. How does the incident wavespeed compare to the reflected wavespeed? How do you know? d. How does the incident frequency compare to the refracted frequency? How do you know? e. How does the incident wavelength compare to the refracted wavelength? How do you know? f. How does the incident wavespeed compare to the refracted wavespeed? How do you know? 12. How would you set up a demonstration in a ripple tank to show total internal reflection? Sketch a diagram to support your answer. ©Modeling Instruction Program 2008 4 L2-Wave Model ws 2 v4.0