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Q .     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 will be

JEE 2000
A

`12`

B

`24`

C

`30`

D

`18`

HINT

Fringe width, `ω = (λD)/d ∝ λ`
0
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