Question

YDSE is made in a liquid. The 10^th bright fringe in the liquid lies where 6^th dark lies in vacuum. The refractive index of liquid is approximately –

• A. 1.8
• B. 1.54
• C. 1.67
• D. 2

Answer 1

Answer: (A)

1.8

Answer 2

$\frac{\mathbf{10D\lambda}}{\mathbf{\mu d}}$= $\frac{11}{2}$ $\frac{D\lambda}{d}$

\ m = $\frac{20}{11}$ = 1.8