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In a Young's double slit experiment the ...

In a Young's double slit experiment the slit are 0.2 mm apart and the screen is 1.5 m away.It is observed that the distance between the central brigth fringe and fourth dark fringe is 1.8 cm .Find the wavelength of light used.

A

500 nm

B

540 nm

C

650 nm

D

480 nm

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