The separation between successive fringes in a double slit arrangement is x. If the whole arrangement is dipped under water what will be the new fringe separation? [The wavelength of light being used is \[5000\,\,\overset{{}^\circ }{\mathop{A}}\,\]]
A)1.5 x
B) x
C)0.75 x
D) 2 x
Correct Answer:
C
Solution :
[c] When the arrangement is dipped in water; \[\beta '=\beta /\mu =\frac{x}{4/3}=\frac{3}{4}x=0.75x\]