Physics - Wave Optics Question with Solution | TestHub

In Young's double-slit experiment, the distance between slits is $d = 0.25 \mathrm{cm}$ and the distance of the screen $D = 120 \mathrm{cm}$ from the slits. If the wavelength of light used is $\lambda =6000 \stackrel{°}{\mathrm{A}}$ and $I_0$ is the intensity of central maximum, then the minimum distance of the point from the centre, where the intensity is $\frac{I_0}{2}$ is $k\times {10}^{-5} \text{m}$. What is the value of $k$?