Read the passage below and answer the question.

If we look clearly at the shadow cast by an opaque object, close to the region of geometrical shadow, there are alternate dark and bright regions. This happens due to a particular phenomenon. It is a general characteristic exhibited by all types of waves, be it sound waves, light waves, water waves or matter waves.

Where else can you find alternate dark and bright regions?

Interference

Alternate bright and dark fringes are seen in interference.