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Refraction
- Refraction is the bending of light rays when
moving across a surface between two mediums
- e.g water to air
- or Air to glass
- e.g water to air
- When light speeds up, the angle of
refraction is larger than the angle of
incidence. if the light slows down it
is smaller
- light speeds up when going
through an object with more
transparency
- light slows down when going
through an object with less
transparency
- Light goes faster in air than it does in
water
- light speeds up when going
through an object with more
transparency
- As the light rays exit the material, it goes back to its normal
speed, so it comes out at the same angle it went in at, but its
target has changed.
- Lasers can be used as a more definite light source
- Next time you are in the bath,put a
pencil half vertically into your bath, what
happens?
- Now try at different
angles!
- Now try at different
angles!
- The difference in angles for different
object is called a refractive index
- Each object has its own, and we can use these to predict how much the angles
will change
- Each object has its own, and we can use these to predict how much the angles
will change
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