If young's double slit experiment is performed in water

Options

A. the fringe width will decrease
B. the fringe width will increase
C. the fringe width will remain unchanged
D. there will be no change

Answer

A

Explanation

As we know `beta=(Dlambda)/(d)......(i)`
`and lambda alpha (1)/(mu).......(ii)`
From Eqs. (i) and (ii)
`beta alpha lambda alpha(1)/(mu)`
`therefore beta alpha(1)/(mu)`
Hence, (a) is correct.