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Refraction lecture

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Felix Bunagan

Light bends when it passes from one medium to another of different density due to a change in speed. When light travels from a less dense medium to a denser one, it bends toward the normal line; when traveling from a denser to a less dense medium, it bends away from the normal line. This bending, or refraction, is caused by the change in speed of light and is determined by the angle of incidence and angle of refraction between the media.

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OBJECTIVES:  Explore the refraction property of light.  Determine what causes bending of light.  Relate refraction of light to real life experiences.
Refraction lecture
Refraction lecture
REFRACTION Is the BENDING of light as it passes OBLIQUELY from one medium to another of different optical density. Examples: Air to water Water to air Water to glass
Why does LIGHT bend?
Light bends because…. 1. Of the change in MEDIUM. Light bends as it moves from one medium to another like from air to water.
Light bends because…. 1. It changes speed as it encounters a different medium.
Refraction lecture
Light does not bend when it enters the medium perpendicularly, however it slows down.
air glass Incident ray 1 Angle of incidence Normal line 2 Angle of refraction Refracted ray
What determines the bending of light?
When light enters a medium of greater optical density, it bends towards the normal.
Normal line incident ray i less dense denser medium r i = angle of incidence r = angle of refraction i>r refraction ray
Normal line cident y i less dense air water denser medium r Light rays bend angle of incidence towards the normal angle 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
Refraction lecture
When light enters a medium of lesser optical density, it bends away from the normal.
Normal line incident ray i denser medium less dense r refraction ray i = angle of incidence r = angle of refraction i<r
dent ray i denser air medium 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
LIGHT ENTERING WATER FROM AIR
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

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Refraction lecture

  • 1. OBJECTIVES:  Explore the refraction property of light.  Determine what causes bending of light.  Relate refraction of light to real life experiences.
  • 4. REFRACTION Is the BENDING of light as it passes OBLIQUELY from one medium to another of different optical density. Examples: Air to water Water to air Water to glass
  • 6. Light bends because…. 1. Of the change in MEDIUM. Light bends as it moves from one medium to another like from air to water.
  • 7. Light bends because…. 1. It changes speed as it encounters a different medium.
  • 9. Light does not bend when it enters the medium perpendicularly, however it slows down.
  • 10. air glass Incident ray 1 Angle of incidence Normal line 2 Angle of refraction Refracted ray
  • 12. When light enters a medium of greater optical density, it bends towards the normal.
  • 13. Normal line incident ray i less dense denser medium r i = angle of incidence r = angle of refraction i>r refraction ray
  • 14. Normal line cident y i less dense air water denser medium r Light rays bend angle of incidence towards the normal angle 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
  • 16. When light enters a medium of lesser optical density, it bends away from the normal.
  • 17. Normal line incident ray i denser medium less dense r refraction ray i = angle of incidence r = angle of refraction i<r
  • 18. dent ray i denser air medium 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
  • 20. 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