Reflection

90 degrees
45 degrees

Point Source

Single
SIngle with Parabolic reflector (Rear)
Double (low frequency)
Double (high frequency)

Reflection

Parabolic Reflector (Behind)
Parabolic Reflector (front)

Decreasing Depth

90 Degrees
45 Degrees

Other

Doppler Effect
Double Gap
Single Gap (Narrow)
Single Gap (Medium)
Double Gap (Wide)
Square Waves
B Waves
Rain drop

Lenses

Concave Lens
Convex Lens