A Young's double slit apparatus has slits separated by 0.28 mm and a screen 48 cm away from the slits. The whole apparatus is immersed in water and the slits are illuminated by the red light (`lamda=700` nm in vacuum). Find the fringe-width of the pattern formed on the screen.

Explanation

To solve the problem step by step, we will follow the given information and apply the relevant formulas.

### Step 1: Convert the given values to standard units.
1. **Distance between the slits (d)**: Given as 0.28 mm.
\[ d = 0.28 \, \text{mm} = 0.28 \times 10^{-3} \, \text{m} \]

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