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Biprism is a device used to obtain...

Biprism is a device used to obtain

A

two cohoerne sources from a single source

B

monochromatic light from two sources

C

both 'a' and 'b'

D

none of these

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A
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Two small angled transparent prisms (each or 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 Å placed at a distance a = 20 cm. Calculate the separation between coherent sources. If a screen is placed at a distance b = 80 cm. from the device, what ist the finge which of fringes obtained (Refractive index of material of each prism = 1.5.)

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A fresnel biprism is used to form the inerference fringes. The distance between the source and the biprisim is 20 cm and that between the biprism and the screen is 80 cm. If A= 6563 A and the separation between the virtual sources is 3.6 mm, then the fringes width (in mm) is.

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