Two small angled transparent prisms (each of refracting angle A=1∘) are so placed that their bases coincide, so that common base is BC. This device is called Fresnel’s biprism and is used to obtain coherent sources of a point source S illuminated by monochromatic light of wavelength 6000 ∘A placed at a distance a=20 cm. Calculate the separation between coherent sources. If a screen is placed at a distance b=80\text{cm}\) from the device, what is the fringe width of fringes (in cm) obtained (Refractive index of material of each prism = 1.5).

Two small angled transparent prisms (each of refracting angle A=1∘)

1.	Two small angled transparent prisms (each of refracting angle A=1∘) are so placed that their bases coincide, so that common base is BC. This device is called Fresnel’s biprism and is used to obtain coherent sources of a point source S illuminated by monochromatic light of wavelength 6000 ∘A placed at a distance a=20 cm. Calculate the separation between coherent sources. If a screen is placed at a distance b=80\text{cm}\) from the device, what is the fringe width of fringes (in cm) obtained (Refractive index of material of each prism = 1.5).
Answer» Two small angled transparent prisms (each of refracting angle $A = 1^{\circ}$ ) are so placed that their bases coincide, so that common base is BC. This device is called Fresnel’s biprism and is used to obtain coherent sources of a point source S illuminated by monochromatic light of wavelength $6000 \circ A$ placed at a distance $a = 20 cm$ . Calculate the separation between coherent sources. If a screen is placed at a distance $b = 80$ \text{cm}\) from the device, what is the fringe width of fringes (in cm) obtained (Refractive index of material of each prism = 1.5).

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