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Fresnel's Biprism MCQ - Practice Questions with Answers
Edited By admin | Updated on Sep 25, 2023 25:23 PM | #NEET
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Fresnel's Biprism
- It is an optical device of produces interference of light Fresnel's biprism is made by joining base to base two thin prism of very small angle.
- When a monochromatic light source is kept in front of biprism two coherent virtual source S1 and S2 are produced.
- Interference fringes are found on the screen placed behind the biprism interference fringes are formed in the limited region which can be observed with the help eye piece.
- Fringes are of equal width and its value is $\beta=\frac{\lambda D}{d}$
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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 $d=2 a(\mu-1) A$
$$
\lambda=\frac{\beta[2 a(\mu-1) A]}{(a+b)} \Rightarrow \beta=\frac{(a+b) \lambda}{2 a(\mu-1) A}
$$
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