Two slits in YDSE are placed 1 mm from each other. Interference pattern is observed on a screen placed 1m from the plane of slits. What is the angular fringe width for a light of wavelength 400 nm

Explanation

To solve the problem of finding the angular fringe width in a Young's Double Slit Experiment (YDSE), we can follow these steps:

### Step 1: Understand the given data
- **Separation between the slits (d)** = 1 mm = \(1 \times 10^{-3}\) m
- **Distance from the slits to the screen (D)** = 1 m
- **Wavelength of light (λ)** = 400 nm = \(400 \times 10^{-9}\) m

### Step 2: Write the formula for angular fringe width
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