\textbf{195-} If we perform Young's double-slit experiment in water instead of air, without changing the light source and without changing the experimental setup, the distance between two consecutive bright fringes will be equal to how much? $\left(n = \dfrac{4}{3}\right)$
\[
\frac{r}{r} \quad (4) \qquad\qquad \frac{r}{f} \quad (3) \qquad\qquad \frac{r}{r} \quad (2) \qquad\qquad \frac{r}{\lambda} \quad (1)
\]