In a Young's double slit experiment,the fringe width will remain the same if ($D =$ distance between screen and plane of slits,$d =$ separation between two slits,and $\lambda =$ wavelength of light used).
- ABoth $\lambda$ and $D$ are doubled.
- BBoth $d$ and $D$ are doubled.
- C$D$ is doubled but $d$ is halved.
- D$\lambda$ is doubled but $d$ is halved.
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