A beam of light consisting of two wavelengths, 650 nm and 520 nm, is used to obtain interference fringes in a Young's double-slit experiment.
Find the distance of the third bright fringe on the screen from the central maximum for wavelength 650 nm.

Explanation

Here, `lambda=650m=650 xx 10^(-9)m, lambda_(2)=520nm=520 xx 10^(-9)m`
Supose `d="Distance between two slits, D=Distance of screen from the slits"`
For third fringe `n=3 Rightarrow x=nlambda, (D)/(d)=3xx650 D/d nm`