A plane wavefront (lambda=6xx10^-7m) fal...

A plane wavefront `(lambda=6xx10^-7m)` falls on a slit `0.4m` wide. A convex lens of focal length `0.8m` placed behind the slit focuses the light on a screen. What is the linear diameter of second maximum?

6 mm

12 min

3 mm

9 mm

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