# Interference and Its Types

## Interference and Its Types:

### What is Interference?

The phenomenon of modification or enhancement in the distribution of intensity in the region of superposition of two or more waves is called Interference.

### Principle of Superposition:

When two or more waves arrive at a point of medium simultaneously, each wave producing its own displacement; so that the resultant displacement at that point is the sum of individual displacements.

### Types of Interference:

There are two types of Interference-

(1) Constructive Interference- When the resultant amplitude is the sum of the amplitudes due to two waves, interference is known as constructive interference.

For constructive interference, the path difference is a whole number multiple of wavelength i.e.

In constructive interference intensity is maximum.

(2) Destructive Interference- When the resultant amplitude is the difference of two amplitudes, i.e. the resultant intensity is minimum, it gives destructive interference.

But for destructive interference,