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Practice 15A Answers

Practice 15A Answers. 18.5° a) 27.5° b) glycerine (n = 1.47) c) 12.5° 1.47. Physics 15.1 Refraction of Light and Snell’s Law. What do you notice a bout the pencil?. I. Refraction. Def – The bending of light as it travels from one medium to another.

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Practice 15A Answers

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  1. Practice 15A Answers • 18.5° • a) 27.5° b) glycerine (n = 1.47) c) 12.5° • 1.47

  2. Physics 15.1Refraction of Light and Snell’s Law What do you notice about the pencil?

  3. I. Refraction • Def – The bending of light as it travels from one medium to another. 1. Must be at an angle other than 90° 2. If 90° then no refraction 3. Occurs when light’s velocity changes • Variables 1. Θi = angle of incidence 2. Θr = angle of refraction

  4. C. Velocity Changes 1. cause light rays to speed up or slow down 2. Situations a. High speed  lower speed Result = Light is bent towards the normal

  5. Light is bent away from the normal b. Low Speed  higher speed Result =

  6. Concept Question When trying to catch a fish, should a pelican dive into the water horizontally in front of or behind the image of the fish it sees? *Answer: Behindof the image, because the light entering the water slows down and is bent towards the normal. Alaskan Natives

  7. E. Barrel Rolling Explanation pg. 563

  8. II. The Law of Refraction • Index of Refraction – ratio of speed of light in vacuum to speed of light in a medium. • Formula n = c / v a. n = index of refraction b. c = speed of light in vacuum c. v = speed of light in medium • Table 15-1 D. Explains a prism

  9. III. Snells’s Law • Def - the relationship between the angle of incidence and angle of refraction of two materials having different index of refraction. B. Formula n1 sin(Θ1) = n2 sin (Θ2) C. Variables 1. n = indexes of refraction 2. Θ = angles of the rays

  10. Ex: A light ray traveling through air strikes a piece of carbon disulfide at an angle of 25.0° to the normal. Find the angle of refraction. 15.0°

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