Physics - Wave Optics Question with Solution | TestHub

In a double slit experiment, when light of wavelength$400\mathrm{ }\mathrm{n}\mathrm{m}$was used, the angular width of the first minima formed on a screen placed$1\mathrm{ }\mathrm{m}$away was found to be$0.2°.$What will be the angular width of the first minima, if the entire experimental apparatus is immersed in water?$\left({\mu }_{\mathrm{w}\mathrm{a}\mathrm{t}\mathrm{e}\mathrm{r}}=\frac{4}{3}\right)$NEET 2019 (All India)