Question

In young's double slit experiment, let A and B be the two slits. A thin films of thickness t and refractive index m is placed in front of A. Let b = fringe width. The central maxima will shift by-

• A. t (m _ 1) $\frac{\beta}{\lambda}$
• B. mt $\frac{\beta}{\lambda}$
• C. $\frac{t\beta}{\mu\lambda}$
• D. None of these

Answer 1

Answer: (A)

t (m _ 1) $\frac{\beta}{\lambda}$

Answer 2

y₀ = $\frac{D}{d}$ (m _ 1) t & b = $\frac{D\lambda}{d}$

\ y₀ = $\frac{\beta}{\lambda}$ (m _ 1) t