What does it mean when sound waves are reflected from the surface along parallel lines?

Answer by  grammergeek (14)

When sound waves are reflected from the surface along parallel lines, it's a phenomena known as Focusing. A flat parallel type of surface like a wall or cliff face gives a focused reflection of a sound (for instance, a horn blast from a nearby ship or a bell on a bouy).

Answer by  worker5534 (518)

Two types of sound waves are there. They are long waves and short ways. Both of the waves are reflected from the surface along parallel lines.