Reflection and Refraction

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Chapter 29 Reflection and Refraction

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Presentation transcript:

Reflection and Refraction Physics Mrs. Coyle

Reflection When a wave reaches a boundary it is: Partially reflected (bounces off surface) Partially transmitted through surface.

Law of Reflection Angle of incidence = Angle of reflection

Note The angle of incidence is formed between the incident ray and the normal. The angle of reflection is formed between the reflected ray and the normal.

Specular Reflection A reflection produced by a smooth surface.

Diffuse Reflection Reflection from a rough surface.

http://micro. magnet. fsu http://micro.magnet.fsu.edu/primer/java/reflection/specular/specularjavafigure1.jpg

Type of Image Real or Virtual Enlarged or Reduced Erect or Inverted

What is the minimum mirror height required for a person to see their full self in the mirror?

Hint: Compare AB to CD C A B D

Refraction

Example Incident Ray Less Rigid Medium More Rigid Refracted ray bends towards the normal. Refracted Ray

Note The speed of light has a lower speed in a more optically dense medium.

Dispersion The index of refraction of glass is different for the colors that make up white light because the speed of light is slightly different in glass for each frequency of light. (In vacuum all colors have speed c=3x108m/s.)