Question

With a monochromatic light, the fringe-width obtained in a Young's double slit experiment is 0.133 cm. The whole set-up is immersed in water of refractive index 1.33, then the new fringe-width is

• A. 0.133 cm
• B. 0.1 cm
• C. 1.33 $\times$ 1.33 cm
• D. $\frac{1.33}{2}$ cm

Answer 1

The correct option is B 0.1 cm

${\beta }^{{}^{\prime }}=\frac{\beta }{\mu }=\frac{0.133}{1.33}$ = 0.1 cm