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In a Young ’ s double slit experiment, 12 fringes are observed to be formed in a certain segment of the screen when light of wavelength 600 nm is used. If the wavelength of light is changed to 400 nm , number of fringes observed in the same segment of the screen is given by

1. 12
2. 18
3. 24
4. 30

Correct answer: 18

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