1. Relfection, Refraction, Diffraction.
Wave Behavior
Relfection, Refraction, Diffraction.

2. Reflection
Reflection occurs when a wave strikes an object and bounces off of it.
All types of wavesincluding sound, water, and light wavescan be reflected

3. Reflection
When a wave bounces off a barrier or surface it is said to be reflected. How much of the wave that is reflected depends on the impedance between the two mediums.
Impedance describes the difference in densities of the two mediums, the greater the difference in mediums, the greater the impedance.
As the impedance increases, more of the wave's energy is reflected instead of being transmitted into the next medium.

4. Echo
Sometimes when the sound waves hit another object, they reflect off it and come back to you.
Your ears hear the sound again, a few seconds after you first heard your footstep.

5. Sonar
How does a bat use reflection to find food?

6. Law of Reflection
The angle formed by the incident beam and the normal is the angle of incidence.
The angle formed by the reflected beam and the normal is the angle of refection.
According to the law of reflection, the angle of incidence is equal to the angle of refection. All reflected waves obey this law.

7. Types of Reflection

8. Refraction
When a wave passes from one medium to anothersuch as when a light wave passes from air to waterit changes speed.
If the wave is traveling at an angle when it passes from one medium to another, it changes direction, or bends, as it changes speed.

9. Glass and light

10. Refraction
Refraction is the bending of a wave caused by a change in its speed as it moves from one medium to another.

11. Sound refraction
Sound wave will refract if there is a difference in air temperature.
The different densities cause the waves to bend.

12. Snell’s Law n1: index of refraction for incidence medium
q1: angle of incidence
n2: index of refraction for refractive medium
q2: angle of refraction
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Speed of an EM wave in a Medium
v = c/n
The index of refraction is defined as the speed of light in vacuum divided by the speed of light in the medium.

13. Critical Angle
The angle of incidence that produces total internal reflection.

14. Interference
When waves appear at the same point in space and time and combine. (superposition)
Constructive
Destructive

15. Diffraction
Diffraction occurs when an object causes a wave to change direction and bend around it.
Diffraction and refraction both cause waves to bend. The difference is that refraction occurs when waves pass through an object, while diffraction occurs when waves pass around an object.

16. Diffraction