Intensity in Interference

Intensity in Interference

### Formula

$$I=I_1+I_2+2\sqrt{I_1I_2}\cos\phi$$

### Terminologies

- I → Resultant intensity.

- I1, I2 → Intensities due to individual waves.

- φ → Phase difference.

### Conditions / Special Cases

Maximum intensity:

$$I_{max}=(\sqrt{I_1}+\sqrt{I_2})^2$$

Minimum intensity:

$$I_{min}=(\sqrt{I_1}-\sqrt{I_2})^2$$

### Usage

- Used in interference intensity problems.