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Two coherent sources are placed 0.9 mm a...

Two coherent sources are placed 0.9 mm apart and the fringes are observed one metre away. The wavelength of monochromatic light used if it produces the second dark fringes at a distance of 10 mm from the central finge will be

A

`6xx10^(4)`

B

`6xx10^(-6)`cm

C

`6xx10^(-7)`cm

D

`1.2 xx10^(4) cm `

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The correct Answer is:
A
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