Ultrasounds can travel along well-defined paths even in the presence of obstacles.

Ultrasounds are high-frequency waves, beyond the range of human hearing, used extensively in industries and medical settings for various purposes.

An obstacle of large size, which may be polished or rough, is needed for the reflection of sound waves.

The incident sound, reflected sound, and surface normal all lie in the same plane.

Both the incident and reflected sound waves make equal angles with the normal to the reflecting surface at the point of incidence.