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Q.

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

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a

fringe width will decrease

b

fringe width will increase

c

fringe width will remain unchanged 

d

fringes will become less intense

answer is A.

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Detailed Solution

As fringe width is  β=λDd and λb<λy, Fringe width decreases if light is changed from yellow to blue.

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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