The graph shows the variation of fringe width $(X)$ versus the distance of the screen from the plane of the slits $(D)$ in Young's double-slit experiment (keeping other parameters constant,where $d$ is the distance between the slits). The wavelength of light used can be calculated as:
- Aslope $\times d^2$
- B$\frac{d}{\text{slope}}$
- C$\frac{\text{slope}}{d}$
- Dslope $\times d$
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