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In young's double slit experiment , the ...

In young's double slit experiment , the slits are 2mm apart and are illuminated by photons of two wavelength `lambda_1=12000overset@A` and `lambda_2=10000 overset@A`. At what minimum distance from the slit will a bright fringe from one interference pattern coincide with a bright fringe from the other?

A

8 mm

B

6 mm

C

4 mm

D

3 mm

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