How does the fringe width, in Young's double-slit experiment, change when the distance of separation between the slits and screen is doubled ?

Explanation

To solve the problem of how the fringe width in Young's double-slit experiment changes when the distance between the slits and the screen is doubled, we can follow these steps:

### Step-by-Step Solution:

1. **Understand the Formula for Fringe Width**:
The fringe width (β) in Young's double-slit experiment is given by the formula:
\[
\beta = \frac{D \lambda}{d}
...