A whole bi prism experiment is immersed in water. If the refractive index of the bi prism and water are 2 and 1.3 with the fringe width in air is \(\beta_0\). Then the value of fringe width in water is
1
\(\frac{10}{7}{{\beta }_{0}}\)
2
\(\frac{7}{10}{{\beta }_{0}}\)
3
\(\frac{100}{7}{{\beta }_{0}}\)
4
\(\frac{50}{7}{{\beta }_{0}}\)