Fresnel's Biprism MCQ - Practice Questions with Answers

Let the separation between $S_1$ and $S_2$ be $d$ and the distance of slits and the screen from the biprism be a and b respectively i.e. $D=(a+b)$. If angle of prism is $A$ and refractive index is $\mu$ then $d=2 a(\mu-1) A$

$$
\lambda=\frac{\beta[2 a(\mu-1) A]}{(a+b)} \Rightarrow \beta=\frac{(a+b) \lambda}{2 a(\mu-1) A}
$$