question_answer

   A double slit arrangement produces fringes for  \[\lambda =5890\overset{o}{\mathop{A}}\,\] that are \[0.4{}^\circ \] apart. What is the angular width if the entire arrangement is immersed in water? \[({{\mu }_{w}}=4/3)\]

A) \[0.3{}^\circ \] 

B) \[2.3{}^\circ \]  

C) \[0.8{}^\circ \] 

D) \[1.3{}^\circ \]