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Plane Mirror – Reflection

Plane Mirror – Reflection. principle axis. C. F. V. Concave Mirror – Reflection. V. F. C. principle axis. Convex Mirror – Reflection. Incident Ray. angle of incidence. normal. angle of reflection. Reflected Ray. Reflection. Light is reflected from some objects.

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Plane Mirror – Reflection

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  1. Plane Mirror – Reflection

  2. principle axis C F V Concave Mirror – Reflection

  3. V F C principle axis Convex Mirror – Reflection

  4. Incident Ray angle of incidence normal angle of reflection Reflected Ray Reflection

  5. Light is reflected from some objects.

  6. You can clearly see through some objects.

  7. When a material transmits all or almost all incident light • Objects can be clearly seen through the material Transparent Objects

  8. Medium 1 Medium 2 Medium 1 Transparent object/medium

  9. Speed of light changes Medium 1 Medium 2 Medium 1 The speed of light varies, depending on the medium of transmission.

  10. Incident Ray Medium – Air Medium – Water Refracted Ray Difference in speed causes light to bend!

  11. Refraction The bending or change in direction of light when it travels from one medium into another.

  12. normal Incident Ray angle of incidence Medium – Air Medium – Water angle of refraction Refracted Ray How to Measure Refraction

  13. Why does light bend when it hits a medium?

  14. Light travelling from air into glass or acrylic: normal Incident angle at 0°: angle of incidence (A) Light travelled straight through Medium – Air Incident Ray Medium – Acrylic From air to glass or acrylic: angle of refraction (B) Angle of refraction less than incident angle A > B Refracted Ray Observations

  15. Light travelling from glass or acrylic to air: normal angle of incidence (C) Angle of refraction more than incident angle. C < D Incident Ray Medium – Acrylic A = D B = C Medium – Air angle of refraction (D) Refracted Ray Observations

  16. Incident Ray, Refracted Ray, and normal all on the same plane (just like reflection). Incident Ray and Refracted Ray are on the opposite sides of the line indicating the separation of two mediums. normal Incident Ray Refracted Ray Conclusions – Refraction

  17. Light bends towards the normal when light in the second medium is slower than the first medium. Light bends away from the normal when light in the second medium is faster than the first medium. normal Incident Ray Refracted Ray Conclusions – Refraction

  18. Observations and Results

  19. Observations and Results

  20. Index of Refraction

  21. Index of Refraction

  22. normal ∠i Speed of light (vacuum) c Space/vacuum ∠R medium v Speed of light (medium) What of the Speed of Light?

  23. Comparing the Speed of Light

  24. Index of Refraction

  25. Index of Refraction

  26. normal ∠i Speed of light (vacuum) c Space/vacuum ∠R medium v Speed of light (medium)

  27. Index of Refractions

  28. The speed of light in ice is . Calculate the index of refraction. Example 1

  29. The speed of light in ice is . Calculate the index of refraction. Example 1

  30. Calculate the speed of light in zircon. Example 2

  31. Calculate the speed of light in zircon. Example 2

  32. The speed of light in salt (sodium chloride) is 1.96108 m/s. Calculate the index of refraction for sodium chloride. • Calculate the speed of light as it is transmitted through olive oil. • Light from air is observed to enter a medium with an incident angle of 51° and a refracted angle of 32°. What is the medium? How fast does light travel through the medium? Questions

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