Chapter 25

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# Chapter 25 - PowerPoint PPT Presentation

Chapter 25. Reflection and Refraction. Reflection and Refraction. Reflection. Reflection. We will focus on specular reflection. The Law of Reflection. All angles are measured with respect to the normal . normal. Multiple reflections. Snell’s Law of Refraction. Refractive Index.

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## Chapter 25

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Presentation Transcript
1. Chapter 25 Reflection and Refraction

2. Reflection and Refraction

3. Reflection

4. Reflection We will focus on specular reflection

5. The Law of Reflection All angles are measured with respect to the normal. normal

6. Multiple reflections

7. Snell’s Law of Refraction

8. Refractive Index

9. Useful facts

10. Reflection and refraction

11. Be careful with the normal

12. More on refractive index

13. Wavelength in different medium

14. Solution

15. Different colors different speed

16. Dispersion

17. What happened to my ruler?

18. Explanation

19. How to catch a fish

20. How to catch a fish

21. The image

22. How to catch a bug

23. Find θair for the following cases: nwater = 1.33

24. Solution Total internal reflection

25. Total Internal Reflection

26. A slightly more accurate picture

27. Total internal reflection (TIR) Total internal reflection occurs when θincident > θc

28. The critical angle, θc θc is the angle of incident θincident when θrefraction = 90o

29. Find the critical angle for diamond in air

30. Shiny diamonds and total internal reflection

31. Cubic Zirconium Refractive index: 2.15 to 2.18 (diamond: 2.42) Hardness: 8.5 to 9 (diamond: 10) Ingredients: zirconium oxide, magnesium, calcium (diamond: carbon)

32. Applications of TIR Fiberoptics

33. Total internal reflection

34. Huygen’s Principle Every point of a wave front may be considered the source of secondary wavelets that spread out in all directions with a speed equal to the speed of wave. The final wave is the sum of all these secondary wavelets.

35. Deriving Snell’s Law of Refraction

36. Principle of Least Time Light always travels between two points in the path that takes the least amount of time.