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In Young's double slit experiment, if the source of light changes from orange to blue then : (1) the central bright fringe will become a dark fringe. (2) the distance between consecutive fringes will decrease. (3) the distance between consecutive fringes will decrease. (4) the intensity of the minima will increase.

1. the central bright fringe will become a dark fringe.
2. the distance between consecutive fringes will decrease.
3. the distance between consecutive fringes will decrease.
4. the intensity of the minima will increase.

Correct answer: the distance between consecutive fringes will decrease.

Solution

When the light source changes from orange to blue, the wavelength of the light decreases. Since the fringe spacing in Young's double slit experiment is inversely proportional to the wavelength, a shorter wavelength results in closer spacing between the fringes.

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