For a path difference of `lambda`, the corresponding phase difference is ……………….radians.

Explanation

To solve the question regarding the phase difference corresponding to a path difference of `lambda`, we can follow these steps:

### Step-by-Step Solution:

1. **Understand the Relationship**:
We know that the phase difference (φ) is related to the path difference (Δx) by the formula:
\[
\phi = \frac{2\pi}{\lambda} \cdot \Delta x
...