Reflection and sound

Reflection and sound

1. Reflection

   • The normal is a construction line
     • Perpendicular to the the reflecting surface at the point of incidence
   • Angle of incidence is equal to the angle of reflection
   • The image produced in a plane mirror is virtual, laterally inverted and upright

2. Sound

   • Sound waves are longitudinal
     • Cause vibrations in a medium which are detected as sound
   • Pitch of sound
     • Determined by its frequency and loudness by its amplitude
   • Echoes are reflections of sounds