Question

Young's double slit experiment is made in a liquid. The 10^th bright fringe in 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: (C)

1.67

Answer 2

10 b₁ = 10 × $\frac{\lambda D}{\mu d}$

in liquid

b₂ = $\frac{\lambda D}{d}$

6b₂ = 10b₁

$\frac{6\lambda D}{d}$ = $\frac{10\lambda D}{\mu d}$

m = $\frac{10}{6}$ = 1.67