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Fresnel's Biprism - Practice Questions & MCQ
Edited By admin | Updated on Sep 18, 2023 18:34 AM | #JEE Main
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Fresnel's Biprism
- It is an optical device for producing 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 eyepiece.
- Fringes are of equal width and its value is $\beta=\frac{\lambda D}{d}$
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- Let the separation between $\mathrm{S}_1$ and $\mathrm{S}_2$ be d and the distance of slits and the screen from the biprism be a and b respectively i.e. $D=(a+b)$. If the angle of the prism is $A$ and the refractive index is $\mu_{\text {then }} d=2 a(\mu-1) A$
$
\therefore \quad \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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