Reflection and Refraction

1
Reflection and Refraction
2
Reflection
3
Reflection

• When a ray of light strikes a surface, the light
  rays may be
• Reflected-the angle the incident beam makes with
  the normal is equal to the angle the reflected
  beam makes with the normal.
• REFRACTED-the ray goes through the surface into
  the new material. When this happens, the ray is
  bent.

4
(No Transcript)
5
(No Transcript)
6
Refraction

• The bending of the light ray is the result of the
  change in the speed of the light as it enters a
  new medium.
• The speed of light in a vacuum is a constant. c
  speed of light 3 x 108 m/s
• The ratio of the speed of light in a vacuum to
  the speed of light in a given material (c/v) is
  called the index of refraction (n)

7
Index of Refraction nc/v where c 3x108 m/s

• The index of refraction for glass is about 1.5
  What is the speed of light in glass?
• The speed of light in air is 2.999 m/s. What is
  the index of refraction in air?

8
n1sin?1 n2sin?2 (Snells Law)