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In Young's double slit experiment, light...

In Young's double slit experiment, light of wavelength `lambda` passes through the double-slit and forms interference fringes on a screen 1.2 m away. If the difference between 3rd order maximum and 3rd order minimum is 0.18 cm and the slits are 0.02 cm apart, then `lambda` is

A

1200 nm

B

450 nm

C

600 nm

D

300 nm

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