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# Refraction lecture

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### Refraction lecture

1. 1. OBJECTIVES: Explore the refraction property of light. Determine what causes bending of light. Relate refraction of light to real life experiences.
2. 2. REFRACTIONIs the BENDING of light as itpasses OBLIQUELY fromone medium to another ofdifferent optical density. Examples: Air to water Water to air Water to glass
3. 3. Why does LIGHT bend?
4. 4. Light bends because….1. Of the change in MEDIUM. Light bends as it moves from one medium to another like from air to water.
5. 5. Light bends because….1. It changes speed as itencounters a differentmedium.
6. 6. Light does not bendwhen it enters themedium perpendicularly,however it slows down.
7. 7. air glassIncident ray 1 Angle of incidence Normal line 2 Angle of refraction Refracted ray
8. 8. What determinesthe bending of light?
9. 9. When light enters a medium ofgreater optical density, it bendstowards the normal.
10. 10. Normal lineincidentray i less dense denser medium ri = angle of incidencer = angle of refraction i>r refraction ray
11. 11. Normal linecidenty i less dense air water denser medium r Light rays bendangle of incidence towards the normalangle of refraction air when the rays travel glass from a less dense medium to a denser refraction ray medium Light rays travel much slower in a denser medium
12. 12. When light enters a medium oflesser optical density, it bends awayfrom the normal.
13. 13. Normal lineincidentray i denser medium less dense r refraction ray i = angle of incidence r = angle of refraction i<r
14. 14. dent ray idenser airmedium water less dense r Light raysray away from refraction bend angle of incidence the normal as it travels= angle of refraction air from a denser medium to a glass less dense medium. Light rays travel much faster in a less dense medium
15. 15. LIGHT ENTERING WATER FROM AIR
16. 16. INDEX OF REFRACTION (n). The ratio of the speed of light in vacuum to the speed of light in the material. n Speed of light in vacuum = C = Speed of light in material v