A double slit set-up was initially placed in a tank filled with water and the interference pattern was obtained using a laser light. When water is…

A double slit set-up was initially placed in a tank filled with water and the interference pattern was obtained using a laser light. When water is replaced by a transparent liquid of refractive index $\displaystyle \mathrm{n}>\mathrm{n}_{\text {water }}$,what will be the effect on the following?

Speed, frequency and wavelength of the light of laser beam.

The fringe width, shape of interference fringes and shift in the position of central maximum.