Reflections from a plane are specular
, meaning that they are well defined because of the regular geometry of the reflecting surface, as opposed to diffuse
, as in the case of an irregular reflecting object. In the latter case, the sound waves are reflected in many different directions. However, although a sphere reflects sound over a wide angle, as we shall see in Sections 12.3 and 12.4
, the reflection is specular because the reflecting surface is regular. Refer to Fig. 4.11
. A plane wave with amplitude
is incident on a plane at x
0, the surface of which has a specific ...