If an interference experiment is performed using two wavelengths close to each other, two interference patterns corresponding to the two wavelengths are obtained on the screen. The fringe system remains distinct up to a point on the screen where the n th order maximum of one wavelength falls on the n th order minimum of the other wavelength. Suppose in Young's double sit experiment, sodium light composed of two wavelengths 
and 
close to each other (with 
greater than 
) is used. The order n, up to which the fringes can be seen on the screen, is given by
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If an interference experiment is performed using two wavelengths close to each other, two interference patterns corresponding to the two wavelengths are obtained on the screen. The fringe system remains distinct upto a point on the screen where the n th order maximum of one wavelength, say 
= 5890 
falls on the n th order minimum of the order wavelength 
= 5895 
. Thus, interference pattern can be seen upto a distance y n from the centre of the screen if
…..(i)
…
or 
or 
This gives,
which is choice 
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