What is the effect on Fresnel's biprism experiment when the use of white light is made?

In Fresnel's biprims experiment, the two sources of light are

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

If white light is used in a biprism experiment, then

In Fresnel's biprism experiment, when the distance between the slit aperture and eye is increased, then distance between the fringes

If Fresnel's biprism experiement as held in water in spite of air, then what will be the effect on fringe width?

In the Fresnels biprism experiment, the two coherrent sources are obtained by :

If the Fresnels biprism experiment is performed in water instead of air, then the distance (d) between the coherrent sources becomes nearly