6. Reflection
Normal-line perpendicular to the
reflecting surface.
Incident ray/incoming ray-the ray
that hits the barrier/surface.
Angle of incidence-angle formed
by the incident ray with the
normal.
9. Reflection
Law of Reflection
the angle of incidence
equals the angle of reflection
The incident ray, reflected
ray and the normal lie on the
same plane
13. Refraction
Refraction
caused by a change in speed
•slower (more dense) refracted
ray bends toward the normal
•faster (less dense) refracted
ray bends away from the normal
24. Diffraction Gratings
glass or plastic made up of
many tiny parallel slits
may also be reflective
spectroscopes, reflective
rainbow stickers, CD surfaces
Diffraction
25.
26. Interference
When two waves meets, they
have an effect with each other.
constructive when the crest
of one wave meet the crest of
the other one