In Young's double-slit experiment, four lights-red, blue, green and yellow- are used. Which colour will have an interference with maximum fringe width?

Explanation

To determine which color will have the maximum fringe width in Young's double-slit experiment, we need to analyze the relationship between fringe width and the wavelength of light used.

### Step-by-Step Solution:

1. **Understanding Fringe Width**:
- The fringe width (β) in Young's double-slit experiment is defined as the distance between two consecutive bright or dark fringes.

2. **Formula for Fringe Width**:
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