Question

Young's double slit experiment is made in a liquid. The 10^th bright fringe in the liquid lies where 6^th dark fringe lies in vacuum. The refractive index of the liquid is approximately –

• A. 1.8
• B. 1.54
• C. 1.67
• D. 1.2

Answer 1

Answer: (A)

1.8

Answer 2

$\frac{\mathbf{10D\lambda}}{\mathbf{\mu d}}\mathbf{=}\frac{\mathbf{11D\lambda}}{\mathbf{2d}}$ ̃ µ = $\frac{20}{11}$ = 1.8