Physics - Wave Optics Question with Solution | TestHub

In a biprism experiment, monochromatic light of wavelength $(\lambda )$ is used. The distance between two coherent sources is kept constant. If the distance between slit and eyepiece (D) is varied as $D_1,D_2,D_3$ and $D_4$, the corresponding measured fringe widths are ${\mathrm{z}}_1,{\mathrm{z}}_2,{\mathrm{z}}_3$ and ${\mathrm{z}}_4$ then