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Width of slit is 0.3mm. Fraunhoffer diff...

Width of slit is 0.3mm. Fraunhoffer diffraction is observed in focus plane of lense of a lense of focal length 1 m. If third minima is at 5 mm distance from central maxima, then wavelength of light is

A

7000 Å

B

6500 Å

C

6000 Å

D

5000 Å

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