In young's double slit experiment the slits are illumated by light of wavelength `5890^(@)` A and the distance between the fringes obtained on the screen is `0.2^(@)`. If the whole apparatus is immersed in water then the angular fringe width will be, if the refractive index of water is `4//3`

Explanation

`alpha_(air)=(lamda)/(d)impliesalpha_(air)impliesalphaproplamdaimplies(alpha_(w))/(lamda_(air))implieslamda_(w)=(lamda_(air))/(mu)impliesalpha_(w)=(alpha_(air)lamda)/(mulamda)=(0.2xx3)/(4)=0.15`