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, what will be number of fringes observed in the same segment of screen.
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Ans. 0018
Sol. Fringe width, w = 
wavelength is decreasing from 600 nm to 400 nm so fringe width is also decreasing by a factor of 
or 
. So no. of fringes will increase by a factor of 
.
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