When the crest of one wave falls on the crest of the second wave, and trough of one wave falls on the trough of the second wave, this phenomenon is called

When the crest of one wave falls on the crest of the second wave, and trough of one wave falls on the trough of the second wave, this phenomenon is called Correct Answer Constructive interference

Concept:

Interference of light is defined as, ”When two or more light waves having the same frequency, same wavelength and same amplitude meet together in a medium at a point, they cancel or enhance the effect of each other at that point.

This phenomenon is called the interference of light waves.

When two light waves superpose with each other in such a way that the crest of one wave falls on the crest of the second wave, and trough of one wave falls on the trough of the second wave, then the resultant wave has larger amplitude and intensity. Such type of interference is called constructive interference

In destructive interference When two light waves superpose with each other in such a way that the crest of one wave coincides the trough of the second wave, then the amplitude and intensity of the resultant wave become zero.