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In a biprism experiment , the two virtua...

In a biprism experiment , the two virtual sources are `0.4` mm apart and the eyepiece is 1.25 mm away from the slit . If the wavelength of light used in 8000 Å , calculate the distance of (i) 8th bright band and (ii) 11th dark band from the central bright band

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The correct Answer is:
(i) 15mm (ii) `19.69` mm
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