Question 332: Waves Optics

Question

In two separate setups for Biprism experiment using same wavelength, fringes of equal width are obtained. If ratio of slit separation is $$2: 3$$ then the ratio of the distance between the slit and screen in the two setups is

Accepted Answer

$$\begin{array}{ll} 
& 	ext { Fringe width, } W=\frac{\lambda D}{d} \
& 	ext { For constant } W 	ext { and } \lambda \
& D \propto d \
	herefore \quad & \frac{D_1}{D_2}=\frac{d_1}{d_2}=\frac{2}{3}
\end{array}$$

Answer

$$2: 3$$

Answer

$$1: 2$$

Answer

$$4: 9$$

Answer

$$9: 4$$

Waves Optics

In two separate setups for Biprism experiment using same wavelength, fringes of equal width are obtained. If ratio of slit separation is $2: 3$ then the ratio of the distance between the slit and screen in the two setups is

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