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Chapter 15: Refraction

Chapter 15: Refraction. Section 1: Refraction. Refraction. Light’s speed and direction change when it enters a different medium video - 10 min. Terms to know. incident ray refracted ray angle of incidence angle of refraction normal (line) critical angle.

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Chapter 15: Refraction

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  1. Chapter 15: Refraction Section 1: Refraction

  2. Refraction • Light’s speed and direction change when it enters a different medium • video - 10 min

  3. Terms to know • incident ray • refracted ray • angle of incidence • angle of refraction • normal (line) • critical angle

  4. (1) Light entering from less to more dense medium, θi > θr • (2) Light entering from more to less dense medium, θi < θr

  5. Our brain thinks that light moves in straight line

  6. Incident Ray vs. Emergent Ray

  7. Example

  8. Critical Angle • Critical angle = the incident angle when the refracted angle is 90 °

  9. Snell’s Law • Snell's law: video (14 min)

  10. Snell’s Law • Incident ray vs. refracted ray • index of refraction = n

  11. Indices of refraction Greater the index, slower the velocity and smaller angle of refraction

  12. LIGHT IN TWO MEDIA

  13. Example 15A, Pg 566 A light ray of wavelength 589 nm (produced by a sodium lamp) traveling through air strikes a smooth, flat slab of crown glass at an angle of 30.0˚ to the normal. Find the angle of refraction, θr.

  14. Reflection • Normal line • An angle measured from the normal line • angle of incidence= angle of reflection • Total Internal Reflection • video - 5 min

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