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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 answer: fringe width will decrease

Solution

Fringe width in Young's double slit experiment is directly proportional to the wavelength of light. Since blue light has a shorter wavelength than yellow light, the fringe width will decrease.

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