Concept Check #6

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Trine University *

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164

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Physics

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Dec 6, 2023

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2

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Concept Check #6: Chapter 25 (Sections 25.1-25.5) Name: ____________________ Geometric Optics Complete the following. If there is an equation used, make sure that is included before the work is done. If there is no equation, give a brief description of how you got your answer. Law of reflection: 1. What is the angle of reflection of a light that is shined at a mirror at an angle of 35 o to the mirror’s surface? (2 points) 2. Use the following ray diagram to answer the following question. Label the normal, incidence, and reflection angles. (4 points) a. What is the angle of reflection at point A? b. What is the angle of reflection at point B? Law of Refraction: 3. If the index of refraction is 1.92, what is the velocity of the light going through the material? (2 points) 4. A laser goes from air into an unknown material at an angle of incidence of 61 o it is refracted at an angle of 35 o . What is the index of refraction? Use table 25.1 in your textbook to identify the unknown material. (3 points) 5. Use the following diagram and table 25.1 to answer the following question.
The laser starts in air at an angle of incidence of 40 o . It goes through the following materials: Material A is ice, material B is benzene, and material C is crown glass. What is the angle of refraction of each material, including the emergent ray? (4 points) Critical Angle and Total Internal Reflection: 6. What is the critical angle when a light beam travels from water to air with an angle of incidence equal to 15 o ? Draw a sketch to show all three rays at that moment. (3 points) 7. Where would total internal reflection occur if a ray is traveling from diamond to water at an angle of incidence of 33 o ? (2 points)
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