Bichromatic light is used in YDSE having wavelengths
` lambda_1 = 400 nm and lambda_2= 700nm`. Find minimum order of bright fringe of `lambda_1`
which overlaps with bright fringe of `lambda_2` .

Explanation

To find the minimum order of the bright fringe of wavelength \( \lambda_1 = 400 \, \text{nm} \) that overlaps with the bright fringe of wavelength \( \lambda_2 = 700 \, \text{nm} \) in a Young's Double Slit Experiment (YDSE), we can follow these steps:

### Step-by-Step Solution:

1. **Understand the Fringe Width Formula**:
The fringe width \( \beta \) in YDSE is given by the formula:
\[
\beta = \frac{\lambda D}{d}
...