In Fresnel's biprism, the shape of interference fringes formed will be

In Fresnel's biprism experiment, on increasing the prism angle, fringe width will,

In a biprism experiment, the distance between the slit and the focal plane of the eyepiece is $50 \mathrm{cm}$. When a convex lens is introduced between the biprism and the eyepiece, then the distance between the images of two virtual sources will be $1.6 \mathrm{mm}$ and $3.6 \mathrm{mm}$ for two different positions of the lens. The distance between the two virtual sources will be

In biprism experiment, the wavelength of monochromatic light used is $6000 \mathrm{\AA }$. The distance between the two virtual sources is $6 \mathrm{mm} .$ The number of fringes formed per $\mathrm{mm}$ on a screen placed $1 \mathrm{m}$ away is

In a biprism experiment, the distance between the slit and the eyepiece is $1 \mathrm{m}$ and distance between the two coherent sources is $0.5 \mathrm{mm}$. If the wavelength of light used is $6000 \mathrm{\AA }$, then distance of the $10^{\text {th }}$ bright band from the central bright band is

In a biprism experiment, the distance between the $3^{\text {rd }}$ and $12^{\text {th }}$ bright bands when light of wavelength $6000 \mathrm{\AA }$ is used is the same as the distance between $4^{\text {th }}$ and $14^{\text {th }}$ bright bands of light of wavelength $\lambda$. The value of $\lambda$ is

In a biprism experiment, to determine the distance between coherent sources, the convex lens is introduced