What is the calculation formula for interference pattern?

The calculation formula for interference pattern can be given by:

I = I1 + I2 + 2√(I1 * I2) * cos(Δφ)

Where:
I = Intensity of the resulting interference pattern
I1 = Intensity of the first wave
I2 = Intensity of the second wave
Δφ = Phase difference between the two waves

Young's Double-Slit Interference Pattern Formula:

```
d sin(θ) = mλ
```

where:

- d is the distance between the slits
- θ is the angle of diffraction (angle from the central fringe)
- m is the order of the maximum or minimum (m = 0 for the central fringe, m = 1 for the first maximum, etc.)
- λ is the wavelength of light