A point source is placed at a distance $\frac{d}{2}$ below the principal axis of an equiconvex lens of refractive index $\frac{3}{2}$ and radius of curvature $20 c m .$ The emergent light from lens having wavelength $λ = 5000 A °$ falls on the slits $S_{1} and S_{2}$ separated by $d = 1 m m$ which are placed symmetrically about the principal axis. The resulting interference pattern is observed on screen kept of a distance $D = 1 m$ from the slits plane.

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Force between charges $F = \frac{k q^{2}}{r^{2}} = 4 \times 10^{- 3} N$
Also $T \sin θ = F$
$Tension T = \frac{F}{\sin θ} = \frac{4 \times 10^{- 3}}{(\frac{1}{20})} = 8 \times 10^{- 2} N$

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