If yellow light emitted by sodium lamp in Young’s double

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

1. fringe width will decrease
2. fringe width will increase
3. fringe width will remain unchanged
4. fringes will become less intense

Correct Option: A

As β =	λD	and λ_b < λ_y,
	d

∴ Fringe width β will decrease