Physics - Wave Optics Question with Solution | TestHub

In a Young's double slit experiment$15$fringes are observed on a small portion of the screen when light of wavelength$500 \mathrm{n}\mathrm{m}$is used. Ten fringes are observed on the same section of the screen when another light source of wavelength$\lambda$is used. Then the value of$\lambda$is (in$\mathrm{n}\mathrm{m}$) __________.