# If yellow light emitted by sodium lamp in Young’s double slit experiment is replaced by monochromatic blue

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If yellow light emitted by sodium lamp in Young’s double slit experiment is replaced by monochromatic blue of light of the same intensity

(a) fringe width will decrease

(b) fringe width will increase

(c) fringe width will remain unchanged

(d) fringes will becomes less intense

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(a) fringe width will decrease

Explanation: As β = $\frac{λD}{d}$ and λb < λγ

∴ Fringe width p will decrease.